This document summarizes human reproductive organs and their functions. It describes the male reproductive organs including the penis, testes, epididymis and their roles in sperm production and transport. It also describes the female reproductive organs including the ovaries, fallopian tubes, uterus and their roles in egg production, fertilization and gestation. The document further explains the hormonal regulation of the reproductive cycle and roles of hormones like estrogen, progesterone, LH and FSH. It provides definitions and descriptions of key stages of reproduction like fertilization, cleavage, implantation and development of the embryo and its membranes and placenta. It highlights potential risks to the fetus from smoking, alcohol and other drug use during pregnancy.
Kulit terdiri atas 3 lapisan utama yaitu epidermis, dermis, dan subkutis. Epidermis terdiri atas beberapa lapisan sel yang memproduksi keratin untuk melindungi tubuh. Dermis berisi pembuluh darah, saraf, dan otot yang memberikan sensasi. Subkutis berisi jaringan lemak sebagai cadangan energi. Kulit memiliki fungsi proteksi, ekskresi, sensorik, dan pengaturan suhu tubuh.
Sistem endokrin terdiri dari kelenjar-kelenjar yang menghasilkan hormon. Kelenjar-kelenjar tersebut antara lain hipotalamus, hipofisis, tiroid, paratiroid, adrenal, pankreas, ovarium, dan testis. Masing-masing kelenjar memproduksi hormon tertentu dan berperan dalam proses metabolisme, pertumbuhan, dan perkembangan tubuh.
Kulit terdiri atas 3 lapisan utama yaitu epidermis, dermis, dan subkutis. Epidermis terdiri atas beberapa lapisan sel yang memproduksi keratin untuk melindungi tubuh. Dermis berisi pembuluh darah, saraf, dan otot yang memberikan sensasi. Subkutis berisi jaringan lemak sebagai cadangan energi. Kulit memiliki fungsi proteksi, ekskresi, sensorik, dan pengaturan suhu tubuh.
Sistem endokrin terdiri dari kelenjar-kelenjar yang menghasilkan hormon. Kelenjar-kelenjar tersebut antara lain hipotalamus, hipofisis, tiroid, paratiroid, adrenal, pankreas, ovarium, dan testis. Masing-masing kelenjar memproduksi hormon tertentu dan berperan dalam proses metabolisme, pertumbuhan, dan perkembangan tubuh.
Dokumen tersebut membahas tentang perkembangan bidan sebagai profesi. Ia menjelaskan bahwa bidan telah ada sejak zaman prasejarah dan memiliki peran penting dalam membantu proses persalinan. Dokumen tersebut juga menjelaskan ciri-ciri bidan sebagai profesi seperti memiliki pendidikan formal, pedoman kerja, dan organisasi profesi. Selain itu dibahas pula persyaratan untuk menjadi bidan profesional dan tug
1. Sistem endokrin terdiri dari hipotalamus, hipofisis, dan organ target seperti tiroid dan gonad yang berfungsi untuk mengatur berbagai proses fisiologi melalui pelepasan hormon.
2. Haid terjadi secara periodik akibat koordinasi antara hipotalamus, hipofisis, ovarium, dan endometrium yang dipengaruhi oleh siklus hormon selama siklus menstruasi.
3. Ovulasi terjadi di pertengahan siklus menstruasi setelah fase folik
Organ reproduksi wanita terdiri dari organ eksternal seperti mons pubis, labia mayor dan minor, klitoris, dan vestibulum. Organ internalnya adalah vagina, rahim, tuba falopi, dan ovarium. Rahim berfungsi sebagai tempat tumbuh kembang janin selama kehamilan. Ovarium menghasilkan ovum dan hormon seksual. Tuba falopi menangkap ovum dan menjadi tempat fertilisasi.
Dokumen tersebut membahas tentang sistem reproduksi pria, meliputi organ genitalia eksterna dan internalnya seperti penis, skrotum, testis, epididimis, saluran keluar testis, dan kelenjar aksesoris seperti vesikula seminalis, prostat, serta proses spermatogenesis dan pengaruh hormon testosteron."
Dokumen tersebut membahas sistem reproduksi wanita, meliputi struktur dan fungsi ovarium, tuba uterina, uterus, dan vagina. Juga dibahas mengenai siklus ovarium dan menstruasi, aktivitas hormon, serta beberapa penyakit yang dapat terjadi pada sistem reproduksi wanita.
[Ringkasan]
Sistem perkemihan terdiri dari ginjal, ureter, kandung kemih, dan uretra. Ginjal memilter darah untuk membentuk urin, yang kemudian dikeluarkan melalui ureter, kandung kemih, dan uretra. Proses ini mencakup filtrasi, reabsorpsi, dan ekskresi untuk mengeluarkan zat buangan dan mempertahankan keseimbangan cairan tubuh.
Dokumen tersebut membahas gangguan pada sistem reproduksi pria dan wanita, termasuk prostatitis, epididimitis, hipogonadisme, impotensi, kanker serviks, vaginitis, bartolinitis, dan kista ovarium. Juga dibahas pengkajian yang meliputi riwayat kesehatan, aktivitas, psikologis, sosial ekonomi, dan fisiologis pasien untuk diagnosis gangguan reproduksi.
Menjelaskan secara garis besar mengenai sistem hormon dan endokrin serta penyakit- penyakit pada sistem hormon. Juga dilengkapi dengan garis besar sistem hormon pada hewan.
Sistem muskuloskeletal terdiri atas otot, tulang, sendi, tendon, dan ligamen yang bekerja sama untuk menoport sistem gerak tubuh. Tulang membentuk kerangka dan sendi yang memungkinkan gerakan, sementara otot berkontraksi untuk menghasilkan gerakan.
Dokumen tersebut membahas tentang sistem endokrin, termasuk pengertian, karakteristik, fungsi, klasifikasi, dan struktur kelenjar endokrin. Kelenjar endokrin utama yang dijelaskan adalah hipotalamus dan hipofisis, tiroid, paratiroid, adrenal, timus, pineal, pankreas, usus, dan kelenjar kelamin.
1) The document discusses animal and human reproduction, including the processes of meiosis, gametogenesis, fertilization, and the hormonal control of the reproductive cycles.
2) It describes spermatogenesis in males, including how sperm develop from spermatogonia in the seminiferous tubules over 7 weeks and are stored in the epididymis.
3) It also explains oogenesis in females, where eggs develop from oogonia over months or years within follicles in the ovaries and are released during ovulation if unfertilized.
Dokumen tersebut membahas tentang perkembangan bidan sebagai profesi. Ia menjelaskan bahwa bidan telah ada sejak zaman prasejarah dan memiliki peran penting dalam membantu proses persalinan. Dokumen tersebut juga menjelaskan ciri-ciri bidan sebagai profesi seperti memiliki pendidikan formal, pedoman kerja, dan organisasi profesi. Selain itu dibahas pula persyaratan untuk menjadi bidan profesional dan tug
1. Sistem endokrin terdiri dari hipotalamus, hipofisis, dan organ target seperti tiroid dan gonad yang berfungsi untuk mengatur berbagai proses fisiologi melalui pelepasan hormon.
2. Haid terjadi secara periodik akibat koordinasi antara hipotalamus, hipofisis, ovarium, dan endometrium yang dipengaruhi oleh siklus hormon selama siklus menstruasi.
3. Ovulasi terjadi di pertengahan siklus menstruasi setelah fase folik
Organ reproduksi wanita terdiri dari organ eksternal seperti mons pubis, labia mayor dan minor, klitoris, dan vestibulum. Organ internalnya adalah vagina, rahim, tuba falopi, dan ovarium. Rahim berfungsi sebagai tempat tumbuh kembang janin selama kehamilan. Ovarium menghasilkan ovum dan hormon seksual. Tuba falopi menangkap ovum dan menjadi tempat fertilisasi.
Dokumen tersebut membahas tentang sistem reproduksi pria, meliputi organ genitalia eksterna dan internalnya seperti penis, skrotum, testis, epididimis, saluran keluar testis, dan kelenjar aksesoris seperti vesikula seminalis, prostat, serta proses spermatogenesis dan pengaruh hormon testosteron."
Dokumen tersebut membahas sistem reproduksi wanita, meliputi struktur dan fungsi ovarium, tuba uterina, uterus, dan vagina. Juga dibahas mengenai siklus ovarium dan menstruasi, aktivitas hormon, serta beberapa penyakit yang dapat terjadi pada sistem reproduksi wanita.
[Ringkasan]
Sistem perkemihan terdiri dari ginjal, ureter, kandung kemih, dan uretra. Ginjal memilter darah untuk membentuk urin, yang kemudian dikeluarkan melalui ureter, kandung kemih, dan uretra. Proses ini mencakup filtrasi, reabsorpsi, dan ekskresi untuk mengeluarkan zat buangan dan mempertahankan keseimbangan cairan tubuh.
Dokumen tersebut membahas gangguan pada sistem reproduksi pria dan wanita, termasuk prostatitis, epididimitis, hipogonadisme, impotensi, kanker serviks, vaginitis, bartolinitis, dan kista ovarium. Juga dibahas pengkajian yang meliputi riwayat kesehatan, aktivitas, psikologis, sosial ekonomi, dan fisiologis pasien untuk diagnosis gangguan reproduksi.
Menjelaskan secara garis besar mengenai sistem hormon dan endokrin serta penyakit- penyakit pada sistem hormon. Juga dilengkapi dengan garis besar sistem hormon pada hewan.
Sistem muskuloskeletal terdiri atas otot, tulang, sendi, tendon, dan ligamen yang bekerja sama untuk menoport sistem gerak tubuh. Tulang membentuk kerangka dan sendi yang memungkinkan gerakan, sementara otot berkontraksi untuk menghasilkan gerakan.
Dokumen tersebut membahas tentang sistem endokrin, termasuk pengertian, karakteristik, fungsi, klasifikasi, dan struktur kelenjar endokrin. Kelenjar endokrin utama yang dijelaskan adalah hipotalamus dan hipofisis, tiroid, paratiroid, adrenal, timus, pineal, pankreas, usus, dan kelenjar kelamin.
1) The document discusses animal and human reproduction, including the processes of meiosis, gametogenesis, fertilization, and the hormonal control of the reproductive cycles.
2) It describes spermatogenesis in males, including how sperm develop from spermatogonia in the seminiferous tubules over 7 weeks and are stored in the epididymis.
3) It also explains oogenesis in females, where eggs develop from oogonia over months or years within follicles in the ovaries and are released during ovulation if unfertilized.
tugas presentasi Fisiologi dari Dosen kami tercinta dr. Warni Sutrisno
presentasi ini disusun oleh :
Yesti Nanda (A102.10.069)
Yhoshiki Alifia (A102.10.070)
Yohana Jennifer (A102.10.071)
Yunika Sapta (A102.10.072)
2014/2015
Akademi Analis Kesehatan Nasional Surakarta
The document discusses sexual reproduction and gamete formation in humans. It covers:
1) How genes determine the development of male or female gonads and the roles of hormones like testosterone and estrogen.
2) The processes of spermatogenesis and oogenesis, which both involve cell division and differentiation to produce haploid gametes.
3) How fertilization occurs through the fusion of egg and sperm, and the early stages of pregnancy including implantation and roles of hormones like HCG.
The document summarizes the male and female reproductive systems. It describes the production of sex cells through meiosis and their roles in fertilization. It then details the key parts and functions of the male reproductive system including sperm production. For the female, it outlines the menstrual cycle, stages of development from fertilization to birth, and hormonal control of reproduction.
The document provides information on the human reproductive systems and gametogenesis. It describes the female reproductive organs including the ovaries, fallopian tubes, and uterus. It also describes the male reproductive organs including the testes, epididymis, and associated ducts. The processes of oogenesis and spermatogenesis are explained in detail including the role of hormones. Fertilization and early embryonic development are summarized. Hormonal control of the menstrual cycle and pregnancy is outlined. Methods of contraception and infertility treatment are briefly discussed.
The document provides information on the human reproductive systems and gametogenesis. It describes the female reproductive organs including the ovaries, fallopian tubes, and uterus. It also describes the male reproductive organs including the testes, epididymis, and associated ducts. The processes of oogenesis and spermatogenesis are explained in detail including the role of hormones. Fertilization and early embryonic development are summarized. Hormonal control of the menstrual cycle and pregnancy is outlined. Methods of contraception and infertility treatment are briefly discussed.
The document provides an overview of the male and female reproductive systems including:
- Primary and secondary sex organs that produce and transport gametes in males (testes, ducts, glands) and females (ovaries, uterine tubes, uterus, vagina).
- The hormonal regulation of the testes and ovaries, including feedback loops between the hypothalamus, pituitary gland, and gonads.
- Spermatogenesis and oogenesis, the processes by which gametes are produced in the testes and ovaries.
- The ovarian and uterine cycles regulated by hormones including estrogen and progesterone. Key events like ovulation and menstruation are described.
- Fertilization and early embryonic development up
This document discusses several topics related to human reproduction and growth, including:
1. It outlines learning objectives on gamete formation, the menstrual cycle, early zygote development, and the role of science and technology in human reproduction.
2. It then provides details on gamete formation in males and females, explaining spermatogenesis and oogenesis.
3. The role of hormones in regulating the menstrual cycle is analyzed, outlining the hormones involved and how they influence follicle development, ovulation, and the endometrium throughout the cycle.
Join us for an introduction to understanding human reproduction! From menstruation to pregnancy, learn about how our bodies work together to create new life. We cover key biological processes involved, discuss common health issues related to the female reproductive system, provide tips on maintaining reproductive health, and address any burning questions you have had regarding sex education. By the end of this presentation, viewers should feel better informed and empowered around these important topics. Let's dive into the fascinating world of reproductive science!
The document discusses the female reproductive system, including both external and internal structures. It describes the female organs such as the ovaries, uterus, vagina, and breasts. It explains the menstrual cycle in females, including the follicular, ovulation, and luteal phases. It also discusses common menstrual problems like premenstrual syndrome, amenorrhea, dysmenorrhea, menorrhagia, and metrorrhagia.
Grade 10 Quarter 3: The Reproductive Systemnikitaitliong
The document discusses the human reproductive system. It describes the key components and functions of both the male and female reproductive systems, including the testes, penis, ovaries, uterus, and other organs. It also explains the important role of hormones like estrogen, progesterone, LH, and FSH in regulating reproduction and the menstrual cycle. The menstrual cycle is summarized as consisting of the menstruation, follicular, ovulation, and luteal phases in a typical 28-day cycle.
This document discusses the anatomy and physiology of the male and female reproductive systems. It describes the structures of the testes, penis, and accessory glands in males. It also discusses sperm development and the hormones that regulate male reproduction. In females, it outlines the ovaries, uterus, vagina, and mammary glands. It explains the menstrual cycle and how hormones regulate female fertility and pregnancy.
MDCAT unit= 14 Reproduction in animals.pptxmudasirfsd333
Reproduction means production of new individuals for next generation it is important for the maintenance of species is but not for the survival of individual reproduction involve fertilization development and growth plants and animal reproduction involve sexual processes while most of unicellular organism involve a sexual reproductions
Animals
The document summarizes the key events and hormonal changes that occur during the human menstrual cycle. It describes the follicular phase where FSH causes follicle growth and estrogen rise, leading to the LH surge and ovulation on day 14. After ovulation the corpus luteum forms and secretes progesterone and estrogen to prepare the uterus for potential implantation during the luteal phase. If implantation does not occur, progesterone and estrogen levels fall, causing menstruation and the start of a new cycle.
The document provides an overview of the human reproductive system, including its anatomy, physiology, development and functions. It describes the key structures and roles of the male and female reproductive systems, from gamete production and fertilization to childbirth. Key topics covered include the gonads, hormones, menstrual cycle, sexual reproduction and development from fertilization through the embryonic stages.
The document provides an overview of the anatomy and physiology of the male and female reproductive systems. It describes the key organs involved in reproduction, including their structures and functions. In the male system, it outlines the role of the testes, ducts, and glands in producing and transporting sperm, and the hormones that regulate the process. In the female system, it describes the ovaries, fallopian tubes, uterus, and other organs, as well as their roles in ovulation, menstruation, and the monthly cycles.
The document summarizes the male and female reproductive systems. It describes the main organs involved in both systems, their functions, and key stages and hormones involved in sperm production and the female menstrual cycle. For males, it outlines sperm development from spermatogonia in the testes through spermiogenesis and the roles of FSH, LH, and testosterone. For females, it describes the menstrual cycle stages under the influence of estrogen and LH from the pituitary and progesterone from the corpus luteum.
Various Parts Of Reproductive Organs& Their Functionsraj kumar
The document describes the male and female reproductive systems and their functions. It discusses gamete formation through spermatogenesis and oogenesis, as well as the hormonal regulation of the menstrual and ovarian cycles. Key hormones and their roles in reproduction are also outlined.
Various Parts Of Reproductive Organs& Their Functionsraj kumar
The document describes the male and female reproductive systems and their functions. It discusses gamete formation through spermatogenesis and oogenesis, as well as the hormonal regulation of the menstrual and ovarian cycles. Key hormones and their roles in reproduction are defined. The processes of mitosis, meiosis, fertilization and early embryonic development are also summarized.
The male and female reproductive systems work together to produce offspring. The male system produces and transfers sperm and the male sex hormone testosterone. The female system produces eggs and the female sex hormones estrogen and progesterone. It receives sperm and nourishes the development of offspring. Both systems also produce gametes and hormones through complex processes regulated by the brain and hormones.
The document provides an overview of the female reproductive system, including the ovaries, fallopian tubes, uterus, vagina, and vulva. It describes the processes of oogenesis and ovulation. It also discusses the formation and function of seminal fluid, sperm development and function, and hormonal regulation of the male reproductive system including testosterone production.
The female reproductive system produces eggs and secretes hormones to support pregnancy. It includes the ovaries, fallopian tubes, uterus, vagina, and external genitals. The ovaries produce eggs and release them during ovulation to travel through the fallopian tubes. If an egg is fertilized, it implants in the uterus. The menstrual cycle is regulated by hormones and results in the shedding of the uterine lining if no implantation occurs. At birth, a female has around 1-2 million eggs that decline over her lifetime, with only around 500 being ovulated.
Dokumen tersebut membahas tentang kromosom dan genetika dasar. Secara singkat, kromosom adalah struktur di dalam inti sel yang mengandung DNA dan menentukan sifat organisme. Kromosom terdiri atas sentromer dan lengan, dan berbeda bentuk antara lain metasentrik, submetasentrik, akrosentrik, dan telosentrik. Kromosom menentukan jenis kelamin melalui sistem XY, ZW, ZO, atau haploid-diploid. Gen
Teks tersebut membahas tentang penyerapan dan transportasi zat hara dalam tumbuhan. Secara singkat, zat hara dapat diserap melalui akar dan daun tumbuhan, dan diangkut ke seluruh bagian tumbuhan menggunakan sistem vaskular. Faktor lingkungan dan internal tumbuhan mempengaruhi efisiensi penyerapan zat hara.
Dokumen tersebut membahas tentang penyerapan dan pengangkutan air pada tanaman. Penyerapan air dapat terjadi secara aktif maupun pasif, sedangkan pengangkutannya dipengaruhi oleh tekanan akar, transpirasi, dan kohesi air. Penyerapan pasif lebih penting dibanding aktif karena beberapa keterbatasan penyerapan aktif.
Gerakan partikel dalam tanaman terjadi melalui proses difusi, osmosis, dan imbibisi. Partikel seperti ion dan molekul masuk dan keluar dari tubuh tanaman untuk memungkinkan pertumbuhan. Gerakan partikel dipengaruhi oleh potensial kimia dan energi kinetik partikel.
Dokumen tersebut membahas tentang transpirasi pada tanaman, yaitu proses hilangnya air dalam bentuk uap melalui stomata. Transpirasi berbeda dengan evaporasi dan gutasi. Transpirasi diatur oleh bukaan dan tutupnya stomata, yang dipengaruhi oleh beberapa faktor lingkungan dan karakteristik tanaman. Transpirasi berperan dalam pengangkutan air dan zat hara serta menjaga suhu daun.
Siklus nitrogen merupakan proses penting dalam lingkungan yang melibatkan berbagai organisme. Nitrogen diambil dari udara oleh organisme melalui proses fiksasi nitrogen dan kemudian dimanfaatkan oleh tumbuhan. Nitrogen berpindah antara berbagai bentuk kimiawi selama siklus ini.
Proses pertumbuhan buah meliputi tahapan pembentukan bunga, penyerbukan, fertilisasi, dan pertumbuhan buah. Hormon dari serbuk sari dan biji berperan menstimulasi pertumbuhan buah. Pertumbuhan buah juga memerlukan mobilisasi nutrisi. Proses penuaan bunga dipengaruhi oleh hormon etilen.
Gerak pada tumbuhan dibagi menjadi 3 golongan yaitu gerak higroskopis, etionom, dan endonom. Gerak etionom meliputi tropisme, nasti, dan taksis yang merupakan gerak yang dipengaruhi rangsangan dari luar.
Dokumen tersebut membahas tentang fisiologi sistem pencernaan pada hewan, mencakup proses di mulut, lambung, dan usus. Terdapat penjelasan mengenai fungsi organ-organ pendukung seperti kelenjar ludah dan lambung, serta enzim-enzim yang terlibat dalam mencerna makanan seperti asam lambung dan pepsin.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
Assessment and Planning in Educational technology.pptxKavitha Krishnan
In an education system, it is understood that assessment is only for the students, but on the other hand, the Assessment of teachers is also an important aspect of the education system that ensures teachers are providing high-quality instruction to students. The assessment process can be used to provide feedback and support for professional development, to inform decisions about teacher retention or promotion, or to evaluate teacher effectiveness for accountability purposes.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
2. Organ reproduksi pria/jantan
Fungsi :
• Penis :Urinasi dan kopulasi
• Uretra :Transport urin dan semen
• Skrotum : Menjaga temperatur testis kira2
30 C dibawah suhu normal tubuh
• Testis :Produksi sperma dan testoteron
3. • Epididmis : Storage and
maturation
• Ureter: Transport sperma ke
uretra
• Vesikel seminalis: Produksi
alkalin semen (temasuk
fruktosa) utk menyediakan
energi utk sperma
6. • Prostat :Produksi 1/3 dari semen termasuk nutrien
dan enzim utk mengaktifkan sperma
• Cowper Gland :sekresi mukus dan bufer alkalin utk
menetralisir kondisi asam uretra.
7. Organ reproduksi
wanita/betina
• Vagina : menerima
penis dan semen serta
saluran kelahiran dan
menstruasi
• Uterus: jalur lintas
sperma, menerima
blastocyst, fetus dan
melindungi fetus dari
suhu yg tdk sesuai
12. Leutenizing Hormone (LH):
• Source: Anterior Pituitary
– Targets & Functions:
• Females - Ovaries
– Stimuli oosit primer menjadi oosit
sekunder
– Memacu ovulasi oosit sekunder
– Transform folikel jadi korpus luteum
– Stimulasi produksi progesteron oleh
corpus luteum
• Males - Seminiferous Tubules
Corpus luteum – Stimulasi produksi (Spermatogenesis)
melalui rangsangan interstitial cells dalam
testes utk sekresi testosteron
13. Estrogen:
• Sources: Pematangan Follicles & Corpus Luteum
– Targets & Functions:
• Tubuh secara umum
– Stimulasi perkembangan organ reproduksi
sekunder
• Uterus
– Stimulasi fase proliferasi siklus estrus
• Ovarium
– oogenesis
• kelenjar mammae
– Stimulasi perkembangan duktus kelenjar
susu
14. Progesteron:
• Source: Corpus Luteum & Placenta
– Targets & Functions:
• Females - Uterus
– Penebalan endometrium
– Stimulasi pelepasan nutrient
– Quiets myometrium
• Females – kelenjar susu
Corpus luteum – Stimulasi perkembangan alveoli utk
produksi air susu
• Females - Anterior Pituitary
– Menghambat produksi dan pelepasan
FSH & LH
15. Testosterone:
• Sources: Interstitial Cells in Testes
– Targets & Functions:
• Tubuh secara umum (Body in general)
– Stimulasi perkembangan organ reproduksi jantan meliputi:
» development of male genitalia
» male skeleton and muscle development
» male patterns for hair growth
» increased RBC production & higher metabolic rate
• Seminiferous tubules
– spermatogenesis
• Anterior Pituitary
– Moderate inhibition of pituitary and hypothalamus
16. Oxytocin:
• Sources: diproduksi oleh hypothalamus.
Disimpan & dilepaskan oleh Posterior
Pituitary
Positive Feedback Mechanisms:
1. Childbirth – kontraksi uterus and serviks
2. Milk letdown reflex
– Targets & Functions:
• Uterus
– Stimulasi kontraksi miometrium
• Kelenjar susu
– Stimulasi kontraksi duktus kelenjar susu untuk pelepasan air susu
17. Prolactin:
• Source: Anterior Pituitary
– Targets & Functions:
• Breasts
– Stimulasi alveoli utk produksi air susu
• Regulation
– Release of prolactin by anterior pituitary is regulated by
hypothalamus production of Prolactin Releasing Hormone (PRH)
& Prolactin Inhibiting Hormone (PIH)
18. Human Chorionic Gonadotropin
(HCG):
• Source: Trophoblasts of blastocyst &
Chorion
– Target & Functions:
• Corpus Luteum
– Memelihara corpus luteum & menyebabkan produksi progesteron
tetap ada pada 4 bulan pertama kehamilan sampai plasenta
menghasilkan estrogen dan progesteron dalam jumlah cukup utk
memelihara kehamilan.
19. Pengaturan hormon ovarium dan
siklus menstruasi
1. Hypothalamus melepaskan
GnRH.
2. GnRH stimulasi anterior
pituitary utk melepaskan FSH. LH
3. FSH stimulasi pertumbuhan Estrogen
folikel dan estrogen. Estrogen
FSH
4. Peningkatan kadar estrogen
menyebabkan anterior pituitary
produksi LH.
20. Hormonal Regulation of
Menstrual & Ovarian Cycles
5. estrogen yang tinggi
menyebabkan LH dilepas untuk
ovulasi dan penebalan
endometrium (proliferative phase)
Estrogen
Estrogen
6. LH stimulasi pembelahan FSH
meiotik pertama oosit primer LH
21. Hormonal Regulation of
Menstrual & Ovarian Cycles
7. LH yg tinggi memacu ovulasi
8. LH yg tinggi menyebabkan Estrogen
folikel ruptur menjadi corpus Estrogen
luteum. FSH
LH
22. Hormonal Regulation of
Menstrual & Ovarian Cycles
9. Corpus luteum produksi
progesteron
Estrogen
10. Progesteron menghambat
Estrogen Progesterone
produksi FSH & LH oleh X
FSH
anterior pituitary & stimulasi LH
X
secretory phase .
23. Hormonal Regulation of
Ovarian & Menstrual Cycles
11. Pengurangan kadar FSH
& LH menyebabkan corpus
luteum tdk berkembang dan
produksi progesteron sedikit.
12. Pengurangan kadar X
Estrogen
estrogen & progesteron
menyebabkan FSH
X
Progesterone
penghambatan FSH & LH LH
dan endometrium yang
menebal akan ruptur
X
(menses).
24. Hormonal Regulation of
Ovarian & Menstrual Cycles
13. Peningkatan kadar
FSH menyebabkan siklus FSH
estrus akan dimulai lagi
25. Definitions & Functions Relative
to Reproduction
• Fertilization:
– Proses dimana gamet jantan dan betina fusi
membentuk zygote diploid.
• Polar Bodies:
– Sel haploid nonfungsional female yg mempunyai
sedikit sitoplasma yg diproduksi pd saat meiosis.
26. Gametogenesis:
Proses pembentukan gamet
• Spermatogenesis: • Oogenesis:
– Produksi gamet jantan – Produksi gamet betina
– Terjadi pd tubulus (oocytes)
seminiferus testis – Terjadi pada ovarium
– pembelahan meiosis – Pembelahan meisosis
– Terjadi stlh individu – Terjadi setelah pubertas
mengalami pubertas sampai menopause
– Produksi 400.000.000 per – Secara normal tiap siklus
day estrus.
35. Hormonal Regulation if
Pregnancy Occurs
Blastocyst produksi
human Chorionic
Gonadotropin (hCG)
hormon yg akan
memelihara corpus luteum
pada trimester pertama. hCG
placenta akan memproduksi
estrogen & progesteron utk
kelangsungan hidup janin.
36. Definitions & Functions Relative
to Reproduction
• Semen:
– Campuran dr semen dan cairan dr glandula
reproduksi jantan utk mensupply energi, mentralkan
kondisi asam pada pd alat reproduksi dan
mengaktifkan sperma.
• Hyaluronidase:
– Enzym pd acrosome menyebabkan nukleus sperma
mampu menembus gamet betina
37. Definitions & Functions
• Zygote:
– Hasil fertilisasi, diploid.
• Cleavage Divisions:
– Pembelahan mitotik dr zigot (preembrio) (2 cell,4 cell,
8 cell, etc.)
• Morula:
– preembryonic cells berbentuk spt buah berry .
40. Definitions & Functions
• Blastocyst:
– cairan yg mengisi rongga dr sel yg
dibentuk pada morula yg implantasi ke
endometrium
• Inner Cell Mass:
– Kmpulan dr sel yg berada di blastocyst.
• Trophoblast:
– Bagian dr dinding luar blastocyst yg akn
membntuk chorion.
64. Mitosis dan Meiosis
• Mitosis:
– Proses dimana nucleus of body cells
membelah menjadi identical daughter cells
utk maintenance, healing & growth.
• Meiosis:
– Proses dimana gamet dibentuk dari separo
jumlah normal kromosom utk reproduksi
seksual.
69. Meiosis
23 23
23
23 23
23
•Hanya pada sel kelamin.
• Synapsis & shuffling of genetic information providing variation.
• Results in reduction of number of chromosomes by half (haploid).
As you go through the notes associated with each slide in this unit, right click the mouse or depress either the right arrow key or the down arrow key to advance the animation or the slide each time you see this symbol *. Depress the left arrow key or the up arrow to return to the previous slide or animation. *
Each testis is filled with tiny tubules * * called seminiferous tubules. * It is within the seminiferous tubules that sperm are produced through the process of spermatogenesis which occurs from puberty on. *
Shown here * is a cross section through a testis showing the seminiferous tubules. The white spaces * represent the central opening or lumen of each tubule. * In this more highly magnified view of seminiferous tubules, you can visualize the development of sperm cells in the walls of the seminiferous tubules. * By the time the sperm cells are fully developed, they are located in the lumen of the tubule. * Between the seminiferous tubules are groups of cells called interstitial cells. * * These are responsible for the production of the male hormone testosterone within the testes. * *
The vagina * * serves as the birth canal during the delivery of an infant, a passageway for menstrual flow and as the female organ of copulation which receives the penis and semen during sexual intercourse. * *
The uterine tubes are also know as the oviducts and the fallopian tubes. * * Their function is to receive the oocyte following ovulation, provide a passageway for the oocyte to be transported to the uterus by means of peristalsis and ciliary action, and serve as an area in which fertilization of the oocyte can occur. * *
Gonadotropin-releasing Hormone (GnRH) * is produced by the hypothalamus. * * It’s target in both males and females is the anterior pituitary gland. * * which it stimulates to produce FSH and LH. * The Hypothalamus also regulates the release of FSH and LH by the anterior pituitary.* *
Follicle stimulating hormone (FSH) * is produced by the anterior pituitary gland. * * It’s target in females * is the ovaries * in which it stimulates the growth and maturation of a follicle * and causes the maturing follicle to produce the hormone estrogen . * The target of FSH in males is the seminiferous tubules. * The effect of FHS is to cause the development of testosterone receptors on the seminiferous tubules, promoting sperm production. * *
Leutenizing hormone (LH) * is produced by the anterior pituitary gland. * * It’s targets in the female are the ovaries. * The effect of LH within the ovaries is to stimulate a primary oocyte * to complete its first meiotic division to become a secondary oocyte. * It triggers ovulation (release) of the secondary oocyte, * the transformation of the ruptured follicle into a corpus luteum * and stimulates the production and release of the hormone progesterone from the corpus luteum. In Males, * the target of LH is the interstitial cells between the seminiferous tubules of the testes. Under the influence of LH, the interstitial cells produce and release testosterone * which binds to the receptors on the seminiferous tubules making possible sperm production (spermatogenesis). *
Estrogen is the principle female hormone. * It is produced by maturing follicles and by the corpus luteum within the ovaries. * Estrogen has a number of targets and functions within the body. * In general, estrogen stimulates the development of female secondary sexual characteristics * which are those that distinguish females from males. These would include the development of female genital organs, breasts, bone development and growth patterns typical of females, etc. * During the uterine cycle, estrogen stimulates the proliferative phase which causes the thickening and growth of the endometrium in preparation for possible implantation of a blastocyst. * Within the ovaries, estrogen promotes oogenesis within a developing and maturing follicle. * It stimulates the development of milk ducts and sinuses (ampullae) within the breasts in preparation for milk production. * Estrogen also has an effect on the anterior part of the pituitary gland in that as estrogen levels in the blood rise to a certain level, it stimulates a burst-like release of the hormone LH from the anterior pituitary. *
Progesterone * is produced initially by the corpus luteum. * If pregnancy occurs, progesterone is also produced by the placenta as well. * It also has several targets and functions within the body. * One of the target organs of progesterone is the uterus. It maintains the thickened condition of the endometrium, stimulates nutrient release from the blood vessels in the walls of the uterus, and decreases muscular contractions of the myometrium. * Progesterone also affects the breasts by stimulating the development of the milk producing glands (alveoli). * Progesterone has the effect on the anterior pituitary gland of inhibiting the production and release of both FSH and LH. *
Testosterone is the male sex hormone. * As indicated previously, it is produced by the intersitital cells in the testes. * Like estrogen in females, testosterone in males has a number of targets and functions. It has a generalized effect on the body to stimulate the development of male secondary sexual characteristics including the development of male genital organs, stimulating male type skeleton and muscle development, male patterns for hair growth, increased red blood cell production and a higher rate of metabolism to name a few. * The seminiferous tubules of the testes also are targets for testosterone. When testosterone binds with receptors on the seminiferous tubules, the process of spermatogenesis may be completed. * The anterior pituitary gland also is affected by testosterone in the blood. It’s effect is to cause moderate inhibition of the pituitary and the hypothalamus. *
The hormone onytocin is manufactured by the hypothalamus and is stored by the posterior pituitary. * It is involved in positive feedback mechanisms * including childbirth * and the milk letdown reflex. * The contractions associated with childbirth are triggered by stretching of the cervix and the uterus as term is reached. * Increasing amounts of oxytocin in the blood triggers the myometrium of the uterus to contract causing the lowering of the fetus and labor. * The suckling effect on the breast of a nursing baby * stimulates the release of oxytocin which when bound to the tissues of the milk ducts and sinuses of the breasts, stimulates the release of milk. *
Prolactin is a hormone stored by the anterior pituitary. * It’s targets * are the alveoli of the breasts, which it stimulates to produce milk. The release of prolactin is regulated by the hypothalamus. * *
Human Chorionic Gonadotropin (hCG) is a hormone that is initially produced and secreted by the trophoblast cells of the blastocyst and later the chorion. * It’s target is the corpus luteum, * which it maintains in the absence of LH. * The effect of hCG on the corpus luteum * is to cause it to continue the production of progesterone during the first four months of pregnancy. By that time, the placenta is producing sufficient estrogen and progesterone to maintain the pregnancy. *
The ovarian cycle begins when rising levels of GnRH from the hypothalamus * * stimulate increased production and release of Follicle Stimulating Hormone (FSH) by the anterior pituitary. * * FSH stimulates one or more follicle cells within the ovaries to grow * * and begin producing estrogen. * *
When estrogen levels in the blood become high enough, * * LH is released by the anterior pituitary gland in a burst. The high estrogen levels also cause the endometrium to thicken. * The sudden release of LH into the blood,* causes the primary oocyte in the mature follicle to undergo the first meiotic division. * *
The high LH levels * also cause the mature follicle to release the primary oocyte (ovulation), * and the remains of the ruptured follicle * to become a corpus luteum. * *
The corpus luteum * * begins to produce and release the hormone progesterone * which inhibits the production of FHS and LH by the anterior pituitary * and stimulates the secretory phase of the ovarian cycle. *
* Diminishing levels of FSH & LH cause the corpus luteum to deteriorate & produce less progesterone. * * * Diminishing levels of estrogen and progesterone * stop the inhibition of FSH & LH by the pituitary gland. * In the absence of adequate levels of progesterone, the thickened endometrium sloughs, causing menses to occur. *
* Increasing levels of FSH * cause a new cycle to begin. *
A spermatozoan * is a male gamete which has completed meiosis 1 and 2, spermiogenesis and is capable of fertilizing a female secondary oocyte. * Fertilization * is the process through which haploid male and female gametes combine to form a single cell (zygote) which has 46 chromosomes. * A human cell with 46 chromosomes (23 from the spermatozoan and 23 from the ovum) is said to be diploid. * Polar bodies * are haploid female cells with an insufficient amount of cytoplasm to be functional for reproductive purposes. * One polar body is produced during the first meiotic division while two additional polarbodies are procuced during the second meiotic division. *
Gametogenesis * is the process through which male and female gametes are formed. * Spermatogenesis is the process through which male sperm are produced. * As indicated previously, spermatogenesis occurs in the seminiferous tubules of the testes. * It involves the process of meiosis through which the number of chromosomes is reduced by half ( from 46 to 23 ). * This process occurs throughout the life of a healthy male after puberty. * As many as 400,000,000 sperm may be produced a day through this process. * * Oogenesis * is the process through which the female gamete (oocyte) is produced. * As previously discussed, oogenesis takes place in a developing follicle within the ovaries. * It also involves meiosis, in which the number of chromosomes within the oocyte changes from 46 to 23. * Oogenesis takes place as a part of the ovarian cycle from puberty until menopause. * In humans, a single oocyte is typically produced during each ovarian cycle. * *
Spermatogenesis takes place in the walls of the seminiferous tubules within the testes. Each of the cells forming the outermost layer of cells in the seminiferous tubules * is called a spermatogonum * and has 46 chromosomes. These cells divide by mitosis * * to form identical daughter cells * with 46 chromosomes. *
Daughter cells go through a growth process * and are referred to as primary spermatocytes * which still have 46 chromosomes. Under the influence of the male hormone testosterone, primary spermatocytes go through the first meiotic division * in which the number of chromosomes is reduced from 46 to 23. * The cells (containing only 23 chromosomes) which are produced through this first meiotic division are referred to as secondary spermatocytes. * *
The secondary spermatocytes produced by through the first meiotic division go through a second meiotic division * in which there is no change in the number of chromosomes (23). * The cells produced through the second meiotic division are referred to as spermatids. * Note that from a single primary spermatocyte * which goes through meiotic divisions I and II, * four spermatids are formed. * *
The early spermatids * then go through a process called spermiogenesis * in which they change in shape and form to become late spermatids * with a flagellum * and other specialized organelles necessary for them to function as male gametes. *
The spermatids * are released into the lumen of the tubule * along which they travel to the epididymis where they complete their development into mature spermatozoa * and are stored. * Note that this entire process of spermatogenesis occurs continually in the walls of the seminiferous tubules after puberty. *
The process of female gamete production is called oogenesis. Oogenesis starts in the ovaries during fetal development, * when the female oogonia (which have 46 chromosomes), * divide by mitosis, * go through a growth phase, and are surrounded by follicle cells to become primordial follicles. The growing oogonium inside each primordial follicle is called a primary oocyte and continues to have 46 chromosomes. * Although the primary oocytes within the primordial follicles begin meiosis, they become stalled toward the end of prophase I. When a female baby is born, she has within her ovaries all of the primordial follicles she will ever have, * and they are all arrested in prophase I of meiosis. These will remain in this state of suspended animation * during childhood * until puberty. While a small number of follicles are activated each month after puberty, under the influence of FSH, only one follicle is selected to develop. *
When LH is released in a burst, the primary oocyte within the dominant follicle completes the first meiotic division * to produce a secondary oocyte with 23 chromosomes * and a nonfunctional polar body. * The polar body is non-functional because the secondary oocyte retains almost all of the cytoplasm from the primary oocyte cell. * Under the influence of LH, the secondary oocyte is ovulated (released) from the follicle. * As the secondary oocyte travels down the oviduct, if it encounters sperm and is fertilized * * the penetration of the secondary oocyte by the sperm cell * triggers a second meiotic division, * resulting in the development of an ovum and three non-functional polar bodies from the original primary oocyte. *
However, the blastocyst * (developing embryo) * produces the hormone human Chorionic Gonadotropin (hCG) * * maintains the corpus luteum * in the absence of FSH & LH for the first trimester of the pregnancy. * Eventually the placenta produces sufficient estrogen and progesterone to sustain the pregnancy. *
A hormone * is a chemical messenger used to regulate reproductibve cycles and activities by binding with receptors on or in target cells. * Semen * is a mixture of spermatozoa and fluid secretions from male reproductive glands which supplies energy to spermatozoa, neutralizes acidic conditions within the male and female reproductive tracts and activates the spermatozoa. * Hyaluronidase * is an enzyme within the acrosome of a sperm cell that enables the sperm nucleus to enter the female ovum. *
Objective 11 A zygote * is a fertilized ovum which is diploid due to the combination of the sperm and ovum nuclei. * Cleavage divisions * refer to divisions of the zygote to increase the number and surface area of cells making up the preembryo (ie, 2 cell stage, 4 cell, 8 cell, etc.). * A morula * is a berry shaped cluster of preembryonic cells produced from the cleavage divisions. * *
Objective 11 A blastocyst * is a hollow, fluid filled sphere of cells formed from the morlula. * The blastocyst implants in the thickened uterine wall, the endometrium. * The inner cell mass * is the mass of cells inside the blastocyst * from which the three primary germ layers develop. * A trophoblast * is the name of the single layer of cells making up the outer wall of the blastocyst. * The trophoblast cells, eventually form the chorion. * *
Objective 11 The chorionic villi * are the finger-like extensions of the trophoblasts * which grow into the endometrium * to acquire nutrients for the preembryo. * The chorionic villi eventually form the placenta. *
Objective 11 Gastrulation * is the process through which the preembryo * becomes an embryo * as the three primary germ layers; * the ectoderm * the endoderm * and the mesoderm * develop to allow for the beginning of organ development. *
Objective 10 The primary germ layer called the ectoderm * produces the brain, spinal cord and nerves; * the cornea and lens of the eyes; * the outer skin and accessory structures * including the hair * and nails; * the enamel of teeth * and the linings of the nasal and oral canals. * *
Objective 10 The endoderm * is the source of the epithelial linings of the digestive tract; * the liver and pancreas; * the tonsils and the epithelial linings of the respiratory tract; * the epithelial linings of the reproductive ducts and glands; * the thyroid, parathyroid and thymus glands, * and the epithelial linings of the bladder and urethra. * *
Objective 10 The mesoderm * produces all types of muscle tissue; * connective tissues, including cartilage, bone and adipose; * bone marrow, blood and lymphatic tissues; * the endothelial linings of blood and lymphatic vessels; the visceral peritoneum of visceral organs; * the fibrous and vascular tunics of the eyes; * and the organs of the urogenital system, including the kidneys, gonads and reproductive ducts. * *
Objective 11 The chorion * is the outermost embryonic membrane * which protects the developing embryo. * The Chorion eventually produces the placenta which provides for the exchange of nutrients and wastes between the mother and the embryo. * *
Objective 11 The amnion * is the membrane * which surrounds the embryo to form the amniotic cavity. * The amnion produces amniotic fluid which bathes the embryo to protect it. * *
Objective 11 The amniotic fluid * bathes the embryo/fetus * protecting it from trauma * and permitting free movement without adhesions. * *
Objective 11 The yolk sack * provides initial nutrients while the placenta is developing, * supplies the first RBC’s * and seeds the gonads with primordial germ cells.* *
Objective 12 The function of the placenta is to provide for the exchange of nutrients from the maternal blood into the fetal blood, without direct mixing of the two. Nutrients move by simple diffusion from areas of higher concentration of each nutrient into the area of lower concentration. Thus O 2 diffuses from the mother’s blood into the blood of the fetus. * The same is true of glucose,* vitamins *, minerals *, etc. *
Objective 12 If the mother carrying the fetus consumes alcohol, * it too diffuses across the placenta from the maternal blood into the fetal blood. The abuse of other drugs and even the use of legally prescribed antibiotics can have an adverse effect on the fetus.*
In addition to supplying nutrients, the placenta also provides a mechanism for the disposal of wastes from the fetus. * Since CO 2 is a metabolic waste and the fetal lungs are not working, concentrations of CO 2 in fetal blood are higher than in the maternal blood. * As a result, excess CO 2 diffuses across the placenta into the maternal blood to be carried off and disposed of. * The same is true of other wastes * including urea. * *
Objective 9 Preembryonic development * occurs from fertilization of the ovum till the third week of development. * From the third week after fertilization through the eighth week of development, * the conceptus is referred to as an embryo . The conceptus is referred to as an fetus * from the 9th week through birth. * The main event that separates embryonic and fetal development, is the beginning of bone formation * which begins during the ninth week. *
For reasons not completely understood, research data indicates that smoking during pregnancy * increases the risk of ectopic pregnancy, * doubles the risk of placenta previa and extopic pregnancy, * slows fetal development, * doubles the risk of low birthweight babies, * increases the risk of cleft palate and lip, and * doubles the risk of sudden infant death syndrome (SIDS).
Cigarette smoke contains more than 2,500 chemicals, not the least of which are carbon monoxide (CO) and nicotine. * Because CO has such a high affinity for hemoglobin, * its effect on RBCs is to reduce the amount of O 2 in the mother’s blood and therefore the amount of O 2 available to the fetus. Because smoking introduces a higher concentration of CO 2 into the lungs, it also effects the CO 2 gradient, thus reducing the amount of CO 2 which diffuses from fetal blood across the placenta in to the maternal blood for elimination. * Smoking also subjects the fetus to the carcinogen nicotine. * *
Objective 12 Fetal alcohol syndrome * is used to describe a pattern of abnormalities found in children born to mothers who reported consuming moderate to large amounts of alcohol during pregnancy. Effects on the fetus vary widely but typically may include * prenatal and postnatal growth retardation; * Central Nervous System involvement including * neurological abnormalities, * developmental delays; * alcohol related birth defects including skull and facial malformations; * mental retardation; * speech and hearing impairment; * and learning, attention and memory deficits. * Although studies indicate a strong correlation between the seriousness of defects and quantities of alcohol consumed during pregnancy, it is not known whether there is a threshold below which alcohol may be consumed during pregnancy without harming the fetus. Therefore, clinicians generally recommend complete abstinance during pregnancy. *
Just as nicotine can cross the placenta, * other drugs may do so as well. Even antibiotics * taken by the mother may cross the placenta and have an effect on the rapidly dividing cells of the growing fetus. * Of course hard core drug use may cause the fetus to become addicted along with the mother. *
Irradiation * including high energy X -rays * and Gamma rays * may affect a fetus by penetrating deeply into fetal tissues, causing ionization of molecules, * may directly or indirectly affect the genetic material of cells, causing point mutations which affect a single base * or break chromosomes causing deletions or translocation of genetic information which may adversely affect fetal cells and tissues. *
Placenta previa * is the medical term used to refer to growth of the placenta across or adjacent to the opening of the cervical canal of the uterus. * Risk factors include: * the number of prior pregnancies, * multiple pregnancies (including twins or triplets, etc.), * and a prior C-section where the scar is close to the cervix. * Symptoms associated with placenta previa may include * spotting during the 1st and 2nd trimesters, and * sudden, painless but profuse vaginal bleeding at any time during the pregnancy. *
The term ectopic pregnancy * is used when the blastocyst implants anywhere other than within the uterus. * Common causes and risk factors for ectopic pregnancy include: * physical blockage of a uterine tube, * scarring of uterine tubes due to prior tubal infections such as venereal diseases causing pelvic inflamatory disease, * and pregnancies following tubal ligation reversal or despite oral contraceptive use. Symptoms associated with ectopic pregnancy include: * unexplained lower abdominal or pelvic pain, * mild cramping on one side of the pelvis * and abnormal vaginal bleeding or spotting. *
Syphilis is a sexually transmitted disease (STD) * caused by the bacterial spirochete Treponema pallidum . * * It is acquired through sexual and transplacental contact with an infected person. Syphilis is the third most commonly reported microbial disease in the U.S.*
Mitosis * is the process through which the nucleus of cells divide to produce two identical daughter cells, each having the same number of chromosomes as the original cell. * Mitosis is the process through which the body maintains grows, heals and maintains itself. * Meiosis * is the process through which gametes are formed with only half of the normal number of chromosomes (ie, in humans the number changes from 46 to 23). These haploid cells (with 23 chromosomes) develop into gametes for sexual reproduction. * Ovum * is the name of the functional female gamete which, as a result of sperm penetration, has completed the first and second meiotic divisions to become haploid. * *
In the cell cycle, mitosis is when the nucleus divides. * Cells spend most of their time in interphase. * * This is when the cells has a definite nucleus, the chromosomes are spread out as chromatin and the cell is actively carrying out normal metabolic activities. Mitosis begins with prophase, * when the nuclear membrane disappears, the chromosomes condense and can be seen as discrete structures, and the centrioles move to opposite sides of the cell and send out spindle fibers which attach to each chromosome.* * The centrioles begin to retract the spindle fibers causing the chromosomes to line up on the equatorial plate of the cell. * When the chromosomes are aligned in this way, the cell is in metaphase. *
As the spindle fibers continue to tug on the chromosomes, the two chromatids making up each chromosome are pulled apart and toward opposite sides of the cell. * Anaphase is the name of this stage when the chromatids from each chromosome are moving to opposite poles of the cell. * * When the chromatids reach the opposite sides of the cell, a nucleus reforms around each cluster, nucleoli reappear and cell membrane forms between the two nuclei to form two identical cells. The division of the cytoplasm is called cytokinesis. All of this occurs in what is called telophase. When the cell membrane completely separates the two daughter cells, telophase is complete * and the daughter cells are considered to be in interphase again. * * During interphase, the DNA making up the chromatids replicates so that each chromosome is composed of two identical chromatids. In mitosis, there is no change in the number of chromosomes or genetic information. If the cell dividing started out with 46 chromosomes, * the daughter cells will have 46 chromosomes. *
Meiosis is a process that occurs in the gonads. In human cells, each cell undergoing meiosis begins with 46 chromosomes. * In prophase I of meiosis, * the same general things occur that happened during prophase of mitosis. * However, homologous chromosomes (one from each parent) pair up in a process called synapsis. * As the genetic information on the corresponding chromosomes from different parents will contain different genetic information, the synapsis and exchange of chromatid parts results in some shuffling and recombination of genetic information. * The spindle fibers from the centrioles attach to each chromosome pair, rather than to each chromosome. * The synapsed chromosome pairs become aligned on the equatorial plate of the cell in metaphase I of meiosis.* Thus the chromosome pairs in metaphase form a tetrad, a cluster of four chromatids. *
In anaphase I of meiosis * the chromosomes forming each pair are pulled apart to opposite sides of the cell. * Telophase I is when the nuclear membrane forms around each cluster of chromosomes at each pole of the cell while cytokinesis occurs. * When cytokinesis complete, each of the daughter cells only contains half of the number of chromosomes that were present in the original cell. * In humans this number would be 23. * This is why the first meiotic division is referred to as the reduction division. *
Meiosis is different from mitosis in that there is a second division of each of the daughter cells just like in mitosis. * The two daughter cells go through the same process as in a normal mitotic division, including prophase II, * metaphase II, * anaphase II, * and finally telophase II and cytokinesis. * There is no change in the chromosome number in the cells. * Thus, as the cells in prophase II have 23 chromosomes, the four daughter cells will contain 23 chromosomes. * * Meiosis is different from mitosis in that * it involved two divisions which only occur in the gonads after puberty, * as a result of the synapsis of homologous chromosomes and the exchange of genetic information that occurs, there is the possibility of greater variation within the daughter cells, * and the number of chromosomes within each of the four daughter cells that go through the process is reduced to half of the normal number * (in humans from 46 chromosomes to 23). *
Contrasting mitosis and meiosis, in mitosis, * the chromosomes line up in metaphase as individual chromosomes. * There is no change in the number of chromosomes within each daughter cell produced through mitosis. * If the cell started out with 46 chromosomes, the daughter cells will be identical with 46 chromosomes. * In meiosis, * chromosomes synapse to form tetrads in prophase I. * As a result, the chromosomes line up in metaphase as tetrads or pairs of homologous chromosomes. * The daughter cells produced from the first meiotic division are haploid, * or contain only half of the number of chromosomes found in the original cell. * The four daughter cells produced in the second meiotic division are haploid, in that they only contain half of the number of chromosomes that were found in the original cell.* These haploid cells become gametes for sexual reproduction. * Since the chromosomes found in the daughter cells include a random distribution of chromosomes from each parent, each of the daughter cells contains genetic information that is unique. *