1 & 2 Weeks Pregnant: What to Expect | Pregnancy Week By Week
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During the first two weeks of pregnancy, an egg is released from the ovaries and travels to the fallopian tubes where it may be fertilized by one of hundreds of millions of sperm. If a single sperm penetrates the egg's protective layer, the genetic material from the father and mother merge to create a unique fertilized egg. This fertilized egg will then travel to the uterus and begin developing into a fetus.
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Fertilization
1) After ovulation, the egg travels to the fallopian tube where millions of sperm begin their journey to fertilize the egg.
2) Fertilization occurs when a single sperm penetrates the egg in the fallopian tube within 24 hours.
3) The fertilized egg then divides rapidly as it travels to the uterus, where it implants in the uterine wall within a week of conception.
Sexual reproduction
Sexual reproduction requires sex cells from both a male and female parent. It can occur internally or externally. Internal fertilization happens inside the female's body, as seen in dogs and chickens where the male's sperm fertilizes the female's egg. External fertilization occurs outside the body, as in frogs and fish where both sex cells are released into water and the sperm must swim to the egg to fertilize it.
3 Weeks Pregnant: What to Expect | Pregnancy Week By Week
Congratulations, you're 3 weeks pregnant. Find out exactly what's happening to your body and your baby during this week of your pregnancy. Get expert advice and all the information you need for your baby and you when you are 3 weeks pregnant.
burrdeck
The female reproductive system has the main function of reproduction. It is made up of internal organs like the ovaries, which produce eggs and sex hormones, and the uterus, where a fertilized egg will implant and develop. During each menstrual cycle, an egg is released from the ovaries into the fallopian tubes. If the egg is fertilized by sperm, it will travel to and implant in the uterus, where the lining has thickened in preparation. If no fertilization occurs, the uterine lining sheds and a period begins.
The reproductory system
The document is a quiz about the female reproductive system. It asks questions about which organs produce and release eggs (ovaries), where fertilization takes place (fallopian tubes), where the fetus develops (uterus), how often a woman releases an egg (approximately every 28 days), what menstruation is (getting rid of the lining and unfertilized egg), and which listed item is not a change in puberty (pregnancy).
Humangrowth
The document discusses the human reproductive system. It defines human reproduction and describes the structure and function of the pituitary gland. It explains the body changes that occur during adolescence due to hormones, including puberty where the sex organs develop and secondary sex characteristics appear. It then describes the male and female reproductive systems, including the organs involved and their functions, such as the testes and ovaries producing eggs and sperm.
The human body and reproductionn
The document discusses the stages of human development from infancy to adulthood. It describes the development of sexual characteristics during adolescence for both boys and girls. It then outlines the male and female reproductive systems and the process of fertilization. When a sperm fertilizes an egg, they form a zygote and then an embryo. The stages of pregnancy are also summarized over three trimesters, describing the growth of the fetus. Finally, the document outlines the three stages of childbirth.
Unit 3. REPRODUCTION
Human beings reproduce sexually. The male reproductive cells are sperm and the female cells are eggs or ova. When a sperm fertilizes an egg, they join to form a zygote which goes through development stages of embryo and fetus in the uterus. Pregnancy lasts around 9 months until childbirth, where the baby passes through the birth canal. The placenta provides nutrients to the developing fetus through the umbilical cord until birth.
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Fertilization
1) After ovulation, the egg travels to the fallopian tube where millions of sperm begin their journey to fertilize the egg.
2) Fertilization occurs when a single sperm penetrates the egg in the fallopian tube within 24 hours.
3) The fertilized egg then divides rapidly as it travels to the uterus, where it implants in the uterine wall within a week of conception.
Sexual reproduction
Sexual reproduction requires sex cells from both a male and female parent. It can occur internally or externally. Internal fertilization happens inside the female's body, as seen in dogs and chickens where the male's sperm fertilizes the female's egg. External fertilization occurs outside the body, as in frogs and fish where both sex cells are released into water and the sperm must swim to the egg to fertilize it.
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The female reproductive system has the main function of reproduction. It is made up of internal organs like the ovaries, which produce eggs and sex hormones, and the uterus, where a fertilized egg will implant and develop. During each menstrual cycle, an egg is released from the ovaries into the fallopian tubes. If the egg is fertilized by sperm, it will travel to and implant in the uterus, where the lining has thickened in preparation. If no fertilization occurs, the uterine lining sheds and a period begins.
The reproductory system
The document is a quiz about the female reproductive system. It asks questions about which organs produce and release eggs (ovaries), where fertilization takes place (fallopian tubes), where the fetus develops (uterus), how often a woman releases an egg (approximately every 28 days), what menstruation is (getting rid of the lining and unfertilized egg), and which listed item is not a change in puberty (pregnancy).
Humangrowth
The document discusses the human reproductive system. It defines human reproduction and describes the structure and function of the pituitary gland. It explains the body changes that occur during adolescence due to hormones, including puberty where the sex organs develop and secondary sex characteristics appear. It then describes the male and female reproductive systems, including the organs involved and their functions, such as the testes and ovaries producing eggs and sperm.
The human body and reproductionn
The document discusses the stages of human development from infancy to adulthood. It describes the development of sexual characteristics during adolescence for both boys and girls. It then outlines the male and female reproductive systems and the process of fertilization. When a sperm fertilizes an egg, they form a zygote and then an embryo. The stages of pregnancy are also summarized over three trimesters, describing the growth of the fetus. Finally, the document outlines the three stages of childbirth.
Unit 3. REPRODUCTION
Human beings reproduce sexually. The male reproductive cells are sperm and the female cells are eggs or ova. When a sperm fertilizes an egg, they join to form a zygote which goes through development stages of embryo and fetus in the uterus. Pregnancy lasts around 9 months until childbirth, where the baby passes through the birth canal. The placenta provides nutrients to the developing fetus through the umbilical cord until birth.
Reproduction lesson 2
This document provides information about the male and female reproductive systems. It identifies and labels the main parts of each system, including the penis, testes, sperm ducts, ovaries, uterus, cervix, and vagina in the male system and ovaries, oviducts, uterus, cervix, and vagina in the female system. It also summarizes the process of fertilization, including the release of sperm and eggs, fertilization occurring when a single sperm fuses with an egg, and the formation of a zygote through rapid cell division.
Chapter 3 class xii
The document discusses the female reproductive system including the ovaries, oviducts, uterus, vagina, and mammary glands. It describes gametogenesis and spermatogenesis in males. The menstrual cycle is explained as occurring approximately every 28 days and consisting of the menstrual, follicular, ovulatory, and luteal phases. Fertilization and implantation are summarized followed by descriptions of pregnancy, embryonic development, parturition, and lactation.
BIOLOGY FORM 5 CHAPTER 4 - 4.1E FERTILISATION & DEVELOPMENT
The document summarizes the process of human reproduction from fertilization through embryonic and fetal development to childbirth. It describes how sperm and eggs are produced, fertilization in the fallopian tube, cleavage and formation of the morula and blastocyst. Implantation in the uterus and formation of the placenta and amniotic sac are explained. Stages of embryonic and fetal development through the trimesters are outlined. The roles of the placenta, umbilical cord and amniotic fluid are summarized. Childbirth and postnatal development including lactation are briefly described. Common topics like twins and congenital abnormalities are also covered at a high level.
Foetal development
Fertilization occurs when a sperm and egg join in the fallopian tube to form a unique human being. Within 30 hours this fertilized egg, called a zygote, begins rapidly dividing as it floats down the fallopian tube towards the uterus. By week 3-5 the embryo's heart begins beating and major organs start to form, while the placenta provides nourishment. By week 7 the embryo has its own blood type and visible features like hair follicles, and by weeks 8-12 it is known as a fetus and can move inside the amniotic sac. The brain is fully developed by weeks 13-16 and the fetus can feel pain and make movements.
Menstrual cycle
This document summarizes the female menstrual cycle. It describes that the menstrual cycle occurs over 28 days in the female reproductive system. It involves changes in the ovaries and uterus. In the ovaries, a follicle develops and then ruptures to release an egg (ovulation). If the egg is fertilized, the corpus luteum forms and secretes hormones to support pregnancy. If not fertilized, the corpus luteum breaks down, hormones decrease, and the uterine lining sheds through menstruation. The cycle then begins again with follicle development. Menarche begins the cycles at puberty and menopause ends them in older age.
7 b reproduction
The document is about the human reproductive system and process. It contains the following key points:
- Humans use sexual reproduction to produce offspring, which requires both male and female sex organs and sex cells.
- In females, eggs are produced in the ovaries and in males sperm is produced in the testes.
- Fertilization occurs when the sperm and egg meet during sexual intercourse, joining their nuclei.
- The fertilized egg implants in the uterus and forms the placenta, which exchanges gases and nutrients between the mother and developing fetus.
Fetal development
The document describes fetal development from conception through the three trimesters of pregnancy. It explains that a baby is considered a newborn from birth to 28 days old, an infant from 1-12 months, and a toddler from 1-3 years old. Conception begins with fertilization, where an egg and sperm unite to form a zygote. The zygote then implants in the uterus and develops into an embryo for the first 8 weeks. After 8 weeks it is called a fetus. Each week of pregnancy is described in detail, outlining physical changes and growth of the fetus. The document concludes that a normal pregnancy lasts about 40 weeks.
Line
1) The document discusses various stages and terms related to human reproduction and prenatal development, including conception, the development of embryos and fetuses, fetal organs and tissues, pregnancy milestones, and potential complications.
2) Key terms defined include ovum, sperm, endometrium, fallopian tubes, conception, embryo, fetus, lanugo, heart, amniotic fluid, placenta, umbilical cord, and fraternal vs identical twins.
3) The stages of prenatal development discussed are from weeks 3-8 (embryo), week 9 onward (fetus), and effects of maternal behaviors like alcohol and smoking.
Sexual Reproduction on Animals
This document describes the three types of embryonic development:
- Oviparous development occurs when the embryo develops outside the mother's body in an egg she lays (e.g. birds, reptiles).
- Viviparous development occurs when the embryo develops inside the mother's body, receiving nutrients from the placenta (e.g. mammals).
- Ovoviviparous development is a combination, with the embryo developing in an egg inside the mother's body until hatching (e.g. some sharks, snakes).
Male female for moodle 2013-14
The document summarizes male and female reproductive structures and the human reproductive process. It describes the testes, scrotum, and other male reproductive organs. It then outlines the ovaries, uterus, fallopian tubes, and other female reproductive organs. It explains the menstrual cycle and how it is regulated by hormones. It details fertilization, implantation of the blastocyst, and the three germ layers formed during gastrulation. Finally, it provides an overview of pregnancy in three trimesters, fetal growth, and birth.
Female Reproductive system
The female reproductive system chapter describes the three stages of labor and delivery as dilation where the cervix dilates from uterine contractions, expulsion where the baby is pushed out, and placental where the placenta is delivered, as well as defining gestation as the normal 40 week fetal development period divided into three-month trimesters and the ovum as the female egg cell involved in fertilization with sperm.
Reproduction
There are two types of reproductive cells, the ovum and sperm, which contain genetic information from both parents. Conception occurs when the ovum and sperm join to form a zygote, which begins dividing and grows as it travels to the uterus. The zygote becomes an embryo that attaches to the uterus wall for protection and floats in amniotic fluid inside the amniotic sac for protection. A placenta then forms to provide oxygen and nutrients from the mother to the growing fetus via the umbilical cord until birth at the end of the ninth month of pregnancy.
The Miracle Of Life
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
The Miracle Of Life 1217169687635199 8
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
From Www[1].Metacafe.Com 32900.94159.1
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
The Miracle Of Life
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
14677975 The Miracle Of Life
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
Stages Of Baby
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
The miracle of life [from www.metacafe.com]
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
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Reproduction lesson 2
This document provides information about the male and female reproductive systems. It identifies and labels the main parts of each system, including the penis, testes, sperm ducts, ovaries, uterus, cervix, and vagina in the male system and ovaries, oviducts, uterus, cervix, and vagina in the female system. It also summarizes the process of fertilization, including the release of sperm and eggs, fertilization occurring when a single sperm fuses with an egg, and the formation of a zygote through rapid cell division.
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The document discusses the female reproductive system including the ovaries, oviducts, uterus, vagina, and mammary glands. It describes gametogenesis and spermatogenesis in males. The menstrual cycle is explained as occurring approximately every 28 days and consisting of the menstrual, follicular, ovulatory, and luteal phases. Fertilization and implantation are summarized followed by descriptions of pregnancy, embryonic development, parturition, and lactation.
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The document summarizes the process of human reproduction from fertilization through embryonic and fetal development to childbirth. It describes how sperm and eggs are produced, fertilization in the fallopian tube, cleavage and formation of the morula and blastocyst. Implantation in the uterus and formation of the placenta and amniotic sac are explained. Stages of embryonic and fetal development through the trimesters are outlined. The roles of the placenta, umbilical cord and amniotic fluid are summarized. Childbirth and postnatal development including lactation are briefly described. Common topics like twins and congenital abnormalities are also covered at a high level.
Foetal development
Fertilization occurs when a sperm and egg join in the fallopian tube to form a unique human being. Within 30 hours this fertilized egg, called a zygote, begins rapidly dividing as it floats down the fallopian tube towards the uterus. By week 3-5 the embryo's heart begins beating and major organs start to form, while the placenta provides nourishment. By week 7 the embryo has its own blood type and visible features like hair follicles, and by weeks 8-12 it is known as a fetus and can move inside the amniotic sac. The brain is fully developed by weeks 13-16 and the fetus can feel pain and make movements.
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This document summarizes the female menstrual cycle. It describes that the menstrual cycle occurs over 28 days in the female reproductive system. It involves changes in the ovaries and uterus. In the ovaries, a follicle develops and then ruptures to release an egg (ovulation). If the egg is fertilized, the corpus luteum forms and secretes hormones to support pregnancy. If not fertilized, the corpus luteum breaks down, hormones decrease, and the uterine lining sheds through menstruation. The cycle then begins again with follicle development. Menarche begins the cycles at puberty and menopause ends them in older age.
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The document is about the human reproductive system and process. It contains the following key points:
- Humans use sexual reproduction to produce offspring, which requires both male and female sex organs and sex cells.
- In females, eggs are produced in the ovaries and in males sperm is produced in the testes.
- Fertilization occurs when the sperm and egg meet during sexual intercourse, joining their nuclei.
- The fertilized egg implants in the uterus and forms the placenta, which exchanges gases and nutrients between the mother and developing fetus.
Fetal development
The document describes fetal development from conception through the three trimesters of pregnancy. It explains that a baby is considered a newborn from birth to 28 days old, an infant from 1-12 months, and a toddler from 1-3 years old. Conception begins with fertilization, where an egg and sperm unite to form a zygote. The zygote then implants in the uterus and develops into an embryo for the first 8 weeks. After 8 weeks it is called a fetus. Each week of pregnancy is described in detail, outlining physical changes and growth of the fetus. The document concludes that a normal pregnancy lasts about 40 weeks.
Line
1) The document discusses various stages and terms related to human reproduction and prenatal development, including conception, the development of embryos and fetuses, fetal organs and tissues, pregnancy milestones, and potential complications.
2) Key terms defined include ovum, sperm, endometrium, fallopian tubes, conception, embryo, fetus, lanugo, heart, amniotic fluid, placenta, umbilical cord, and fraternal vs identical twins.
3) The stages of prenatal development discussed are from weeks 3-8 (embryo), week 9 onward (fetus), and effects of maternal behaviors like alcohol and smoking.
Sexual Reproduction on Animals
This document describes the three types of embryonic development:
- Oviparous development occurs when the embryo develops outside the mother's body in an egg she lays (e.g. birds, reptiles).
- Viviparous development occurs when the embryo develops inside the mother's body, receiving nutrients from the placenta (e.g. mammals).
- Ovoviviparous development is a combination, with the embryo developing in an egg inside the mother's body until hatching (e.g. some sharks, snakes).
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The document summarizes male and female reproductive structures and the human reproductive process. It describes the testes, scrotum, and other male reproductive organs. It then outlines the ovaries, uterus, fallopian tubes, and other female reproductive organs. It explains the menstrual cycle and how it is regulated by hormones. It details fertilization, implantation of the blastocyst, and the three germ layers formed during gastrulation. Finally, it provides an overview of pregnancy in three trimesters, fetal growth, and birth.
Female Reproductive system
The female reproductive system chapter describes the three stages of labor and delivery as dilation where the cervix dilates from uterine contractions, expulsion where the baby is pushed out, and placental where the placenta is delivered, as well as defining gestation as the normal 40 week fetal development period divided into three-month trimesters and the ovum as the female egg cell involved in fertilization with sperm.
Reproduction
There are two types of reproductive cells, the ovum and sperm, which contain genetic information from both parents. Conception occurs when the ovum and sperm join to form a zygote, which begins dividing and grows as it travels to the uterus. The zygote becomes an embryo that attaches to the uterus wall for protection and floats in amniotic fluid inside the amniotic sac for protection. A placenta then forms to provide oxygen and nutrients from the mother to the growing fetus via the umbilical cord until birth at the end of the ninth month of pregnancy.
The Miracle Of Life
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
The Miracle Of Life 1217169687635199 8
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
From Www[1].Metacafe.Com 32900.94159.1
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
The Miracle Of Life
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
14677975 The Miracle Of Life
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
Stages Of Baby
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
The miracle of life [from www.metacafe.com]
An embryo develops in the womb over several weeks. It receives nutrients from the yolk sac at first, then the umbilical cord. While floating calmly in the uterus, the embryo grows limbs by 16 weeks and can move its hands and feet, though the mother cannot see this. By 24 weeks, the lungs are almost fully formed and the embryo could survive if born, blinking its eyes and sucking its fingers. After 9 months of development from a single cell, the fetus is ready to be born.
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This narrated presentation discusses the development of 4 different species, two are deuterostomes and 2 are protostomes (one from the phyla Cnidaria, one from the phyla arthropoda, and two from the phylum chordata) development discussed is from early embryonic or egg stage to a mature adult. The presentation focuses on morphological development but also may key in on the purpose of each developmental stage. The creatures representing each of the phyla include the jellyfish, the honeybee, the elephant, and the platypus. Interestingly, Cnidaria have both sexual and asexual stages in their life cycle. The honeybee larvae have 3 different developmental paths they can take, the elephant has an extremely long gestation period, and the platypus is an egg-laying mammal. The video focuses on the uniqueness of each organisms development.
Honey bee
1. Honey bee queens control the sex of their offspring by determining if eggs are fertilized or not, with unfertilized eggs becoming male drones and fertilized eggs becoming female workers or queens.
2. During mating flights, virgin queen bees mate with multiple male drones in mid-air, storing sperm that will fertilize her eggs for her entire life.
3. The development time for each caste differs, with queens developing in 16 days, workers in 21 days, and drones taking 24 days to reach adulthood.
4- Fertilization and Pregnancy
Fertilization in humans occurs in the fallopian tubes within hours of sexual intercourse. Only one sperm out of hundreds of millions can fertilize the female egg. The sperm must swim through the fallopian tube to reach the egg, breaking through its coating with enzymes to penetrate and fertilize it. Once fertilized, the sperm tail detaches and the egg coating thickens to prevent other sperm from entering.
fertilization-earlyembryodevt-140506222603-phpapp01.pdf
The document summarizes key stages of human fertilization and embryonic development. It describes how fertilization occurs through the fusion of sperm and egg cells. It then outlines the early cleavage and differentiation stages, including the formation of the morula, blastula and gastrula. It discusses the development of the three germ layers and how organs begin to form. Later stages covered include placenta and fetal development, as well as the roles of the umbilical cord, amniotic sac and other structures. Common complications like teratogens and types of twins are also summarized.
Fertilization early embryo dev't
The document summarizes key stages of human fertilization and embryonic development. It describes how fertilization occurs through the fusion of sperm and egg cells. It then outlines the early cleavage and differentiation stages, including the formation of the morula, blastula and gastrula. It discusses the development of the three germ layers and how organs begin to form. Later stages covered include placenta and fetal development, as well as the roles of the umbilical cord, amniotic sac and other structures. Common complications like teratogens and types of twins are also summarized.
Human reproduction
Human reproduction involves the combination of male and female reproductive cells or gametes. During puberty, physical changes like growth of body hair and changes in body shape prepare the bodies of boys and girls for reproduction. The male reproductive system produces millions of sperm cells daily in the testes, while the female system releases a mature egg once a month from the ovaries. Fertilization occurs when sperm fertilizes an egg, initiating pregnancy, which lasts about nine months until birth.
Gastrulation Happen Epiblast Cells.docx
Sperm migration and fertilization is a complex process. Hundreds of millions of sperm are ejaculated but only a few hundred typically reach the fallopian tubes. The sperm undergo capacitation as they migrate, which prepares them to penetrate the egg. Upon reaching an egg, one sperm undergoes an acrosomal reaction and penetrates the layers surrounding the egg. Fertilization occurs as the sperm and egg nuclei fuse. Implantation of the blastocyst in the uterus follows approximately 6 days after fertilization. Gastrulation then occurs as cells from the epiblast migrate and form the three primary germ layers.
Formation of the egg
The document summarizes the formation of the egg in chickens. It describes how the yolk forms in the ovary over 10 days as materials are deposited in layers. When mature, the yolk is released through ovulation into the oviduct. As it passes through the oviduct over 1-3 days, different sections add the albumen, shell membranes, calcium carbonate for the shell, and cuticle. Factors like lighting, diet, and genetics can influence yolk size, ovulation timing, and egg quality. The oviduct has specific sections for picking up the yolk, secreting albumen layers, adding other layers, and passing the completed egg.
Prenatal development..
This document summarizes fetal development from conception through 28 weeks of pregnancy. It describes the key stages and changes that occur each month, including formation of major organs in the first month, development of facial features at 4-8 weeks, quickening and fetal movement around 20 weeks, and increased weight and activity from 20-28 weeks. An ultrasound is typically performed at 20 weeks to check fetal growth and development.
First week of development
Hello friends..you can use these notes for your convenience as they are taken from many other standard books.. Thank you.
Fertilization and Implantation by Dr. Elioba J. Raimon.pptx
Fertilization is the process where the male and female gametes, or pronuclei, fuse to form a single cell called a zygote. It takes place in the fallopian tubes within 12-24 hours of ovulation. The male gamete, or sperm, must undergo capacitation and the acrosome reaction to penetrate the barriers of the female gamete, or egg. Once the sperm fuses with the egg, it activates the completion of the second meiotic division of the egg. The male and female pronuclei then form, with 23 chromosomes each, and their chromosomes combine to restore the diploid number of 46 chromosomes and form the zygote's embryonic genome.
Developmental genetics(fertilization and gametogenesis)
This document summarizes gametogenesis and fertilization in humans. It describes the processes of spermatogenesis and oogenesis, how sperm and eggs are produced through meiosis and cellular differentiation. It explains how sperm transit the female reproductive tract and capacitation prepares them to fertilize the egg. Fertilization occurs when a sperm fuses with an egg in the fallopian tube, forming a zygote with a full complement of genetic material to develop as an embryo.
Reproduction and Development Power Point revised feb2018.ppt
After fertilization, the zygote undergoes cell division through cleavage and develops into a morula, then a blastula. The blastula forms a gastrula through cell differentiation and the embryo implants in the uterus. The male reproductive system produces sperm in the testes which is stored and transported via the epididymis, vas deferens, urethra and released through the penis during ejaculation. The female reproductive system contains ovaries which release eggs and produce hormones, fallopian tubes for fertilization, a uterus for implantation and development, and a vagina that serves as the birth canal.
New life
A new life begins when a sperm fertilizes an egg within the mother's body. The fertilized egg then divides to form a single cell that grows into an embryo over approximately 40 weeks of pregnancy. During pregnancy, the embryo is nourished through the placenta and umbilical cord. Near the end of pregnancy, the baby turns head-down and labor contractions begin that push the baby through the birth canal. The umbilical cord is cut after birth.
Pregnancy
1. Oogenesis begins before birth as oogonia undergo mitosis to form primary oocytes, which begin but halt meiosis. At puberty, one oocyte resumes meiosis to become the ovum.
2. Fertilization occurs when a sperm penetrates the ovum in the fallopian tube. The zygote then undergoes cleavage and forms a blastocyst, which implants in the uterus.
3. If implantation is successful, the blastocyst develops into an embryo with three germ layers—ectoderm, mesoderm, and endoderm—over the course of the first trimester. Concurrently, the placenta forms to support fetal development.
Human reproduction ppt
The document provides information about human reproduction:
- It describes the male and female reproductive systems and the journey of sperm and egg through the systems. The sperm fertilizes the egg in the fallopian tubes.
- It explains the process of fertilization and the early stages of development from zygote to embryo to fetus. The fetus develops over nine months before birth.
- Key parts of the male system that are mentioned include the testes, penis, and sperm. The female system includes the ovaries, uterus, fallopian tubes, and vagina.
Similar to 1 & 2 Weeks Pregnant: What to Expect | Pregnancy Week By Week (20)
fertilization-earlyembryodevt-140506222603-phpapp01.pdf
fertilization-earlyembryodevt-140506222603-phpapp01.pdf
Fertilization and Implantation by Dr. Elioba J. Raimon.pptx
Fertilization and Implantation by Dr. Elioba J. Raimon.pptx
Developmental genetics(fertilization and gametogenesis)
Developmental genetics(fertilization and gametogenesis)
Reproduction and Development Power Point revised feb2018.ppt
Reproduction and Development Power Point revised feb2018.ppt
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