The document discusses how calcium regulation is important for many body functions and how hypocalcemia and hypercalcemia occur with insufficient or excess calcium levels. It describes how parathyroid hormone (PTH) and vitamin D work to enhance calcium absorption by stimulating calcium release from bones and absorption in the intestines. PTH increases calcium levels while vitamin D helps form strong bones and protects against osteoporosis, cancer, and hypertension.
sex-hormones belong to the steroid class of compounds and are produced in the gonads, i.e., testes in the male and ovaries in the female. In fact, their activity seems to be controlled and monitored by the hormones that are produced in the interior.
It has been observe that as the man gets old the testosterone level goes down which leads to serious changes in the functions of the body. The patient should be investigated and if testosterone is low and the symptoms are present, such cases need testosterone replacement therapy.
sex-hormones belong to the steroid class of compounds and are produced in the gonads, i.e., testes in the male and ovaries in the female. In fact, their activity seems to be controlled and monitored by the hormones that are produced in the interior.
It has been observe that as the man gets old the testosterone level goes down which leads to serious changes in the functions of the body. The patient should be investigated and if testosterone is low and the symptoms are present, such cases need testosterone replacement therapy.
Creative Enzymes is a worldwide leading company in diagnostic enzymes manufacturing and supply. We are committed to providing our customers with diverse enzyme products and custom enzyme-related services for medical and research diagnosis. Relying on our professional team and state-of-art technologies, we have gained solid reputation for having top of the line products and services. https://diagnostic-enzymes.creative-enzymes.com/
Creative Enzymes is a worldwide leading company in diagnostic enzymes manufacturing and supply. We are committed to providing our customers with diverse enzyme products and custom enzyme-related services for medical and research diagnosis. Relying on our professional team and state-of-art technologies, we have gained solid reputation for having top of the line products and services. https://diagnostic-enzymes.creative-enzymes.com/
<PARATHYROID HORMONES (The Calcium Regulating Gland)> first recognized in 1850 by Richard Owen.
<INTRODUCTION>Parathyroid glands are small glands of the endocrine system which are located in the neck behind the thyroid.><Called parathyroid due to proximity to the thyroid gland.><Yellowish brown, small ovoid bodies about 6 mm long, 3mm wide and 2mm thick.><Human being have 4 tiny parathyroid glands.><Each weighting around 30-50mg, but may weight as much as 70 mg, and in diameter is 3-4 or till 8 millimeters>
<Each parathyroid gland is made up of chief cells and oxyphil cells.><Chief cells more numerous, smaller, with a slightly eosinophilic cytoplasm.><secrete Parathyroid hormone (PTH). Also known as parathormone or parathyrin.>
<PARATHORMONE>Protein in nature (84 amino acids)><Molecular weight= 9,500.>< Half- life = 10 minutes><Normal plasma level of PTH = 1.5 to 5.5 ng/dL>
<SYNTHESIS OF AND SECRETION OF PARATHORMONE>PTH is encoded by a gene in chromosome 11><After translation, it become pre-pro-parathyroid hormone (pre-pro-PTH) contains 115 amino acids><In endoplasmic reticulum 29 amino acids removed, so it called pro-parathyroid hormone (pro-PTH) contains 89 amino acids><In the Golgi, removed more amino acids by peptidase to become mature hormone (PTH).><It is stored in secretory vesicles within the cells, and released when required>
<METABOLISM OF PTH>Half-life= 4 minute><60- 70 % of PTH is degraded by kupffer cells of liver, by means of proteolysis><Degradation of about 20-30% PTH occurs in kidneys and to a lesser extent in other organs>
<Half life – 4 min. How does PTH produce its effect on biological system?>
<REGULATION OF PARATHORMONE SECRETION>Regulators of secretion of PTH include calcium, vit D and phosphorus.>
<MECHANISM OF SECRETION OF PARATHORMONE> <CALCIUM-SENSING RECEPTORS (CaSR)><CaSR is a plasma membrane or a cell surface receptor, structured as G protein-coupled that is expressed in the parathyroid hormone-producing chief cells of the parathyroid gland and the cells lining the kidney tubule. (Hendy & et al., 2000)><PTH RECEPTORS>PTHR1 is physiologically more important than others two.><PTHR = 60-80 kDa membrane glycoprotein.>
<ACTION OF PTH>Important role in maintaining blood calcium level.>< Also controls blood phosphate level>
<DISORDERS OF PARATHORMONE.><increased pth secretion leads to an increase in serum levels by increasing bone resorption and enhancing renal calcium reabsorption. >
<3 TYPES>Primary hyperparathyroidism, Secondary hyperparathyroidism, Tertiary hyperparathyroidism.><The most common cause of hypercalcaemia is primary hyperparathyroidism>
Physiology of Parathyroid glands
Outline :
- Location of Parathyroid glands.
- Who discovered the glands.
- Some info. about it.
- Parathyroid hormone.
- Histology of the gland.
- PTH biosynthesis.
- The calcium-sensing receptors (CaSR)
- Why Calcium is so Important?
- Calcitonin
- vitamin D
-Metabolic bone diseases (Hypercalcaemia and hypocalcaemia)
Hyperparahyroidsm is an endocrinal disorder majorly affecting the parathyroid glands which secrete parathyroid hormone and calcitonin.
A condition characterised by excessive secretion of calcium in blood and Bone resorption and inanbility to metabolise calcium in blood.
Skizofrenia merupakan suatu deskripsi sindroma dengan variasi penyebab (banyak yang belum diketahui) dan perjalanan penyakit (tak selalu bersifat kronis atau "deteriorating") yang luas, serta sejumlah akibat yang tergantung pada perimbangan pengaruh genetik, fisik, dan sosial budaya.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Francesca Gottschalk - How can education support child empowerment.pptx
Building strong bones
1. Building Strong Bones
Calcium and phosphorous are the most abundant minerals found in the body, and the majority of
both minerals are found in the skeletal system. Calcium regulation is required for many basic
body functions, such as cell function, bone structure, blood clotting, and neural transmission.
Insufficient calcium or loss of calcium is called hypocalcemia, whereas too much calcium in the
blood, often a result of malignancy or primary hyperthyroidism, is called hypercalcemia. The
body regulates calcium through the parathyroid hormone (PTH) and vitamin D, and, to a lesser
extent, calcitonin.
Enhancing Calcium Absorption with PTH and Vitamin D
PTH Vitamin D
Enhances calcium absorption in the
intestines by stimulating the renal synthesis
of 1.25(OH)2D
Increases the amount of calcium in the
blood through the release of PTH and the
removal of calcium from the bone
Decreases the amount of calcium by
releasing less PTH
Helps to form and maintain strong and
healthy bones by increasing the amount of
dietary calcium absorbed by the intestines
Stops the parathyroid gland from secreting
parathyroid hormone, which would increase
levels of calcium in the blood
Protects against osteoporosis, cancer, and
hypertension
2. Membangun Tulang Kuat
Kalsium dan fosfor adalah mineral yang paling berlimpah ditemukan dalam tubuh , dan
mayoritas dari kedua mineral yang ditemukan dalam sistem kerangka . Regulasi kalsium
diperlukan untuk banyak fungsi dasar tubuh , seperti fungsi sel , struktur tulang , pembekuan
darah , dan transmisi saraf . Kalsium atau kehilangan kalsium cukup disebut hipokalsemia ,
sedangkan terlalu banyak kalsium di dalam darah , sering merupakan akibat dari keganasan atau
hipertiroidisme primer , disebut hiperkalsemia . Tubuh mengatur kalsium melalui hormon
paratiroid ( PTH ) dan vitamin D , dan , pada tingkat lebih rendah , kalsitonin .
Meningkatkan Penyerapan Kalsium dengan PTH dan Vitamin D
PTH
. Meningkatkan penyerapan kalsium di usus dengan merangsang sintesis ginjal 1,25 ( OH ) 2D
. Meningkatkan jumlah kalsium dalam darah melalui pelepasan PTH dan penghapusan kalsium
dari tulang
. Mengurangi jumlah kalsium dengan melepaskan kurang PTH
vitamin D
. Membantu untuk membentuk dan mempertahankan tulang yang kuat dan sehat dengan
meningkatkan jumlah kalsium yang diserap oleh usus
. Menghentikan kelenjar paratiroid dari mensekresi hormon paratiroid , yang akan meningkatkan
kadar kalsium dalam darah
. Melindungi terhadap osteoporosis , kanker , dan hipertensi
3. Estrogens and androgens
Likewise, the importance of sex steroids for bone metabolism became obvious from
clinical observations. Lack of these hormones in various forms of hypogonadism
results in osteoporosis. Overproduction of androgens or estrogens during childhood
initially accelerates growth (as normally seen around puberty) but results in early
epiphyseal closure with reduced final height. Postmenopausal osteoporosis starts with
a decrease in estrogen concentrations.
Both estrogen and androgen receptors are expressed in either sex. Regarding bone
resorption, estrogens reduce the number and activity of osteoclasts. Rather, they
regulate the system indirectly via several different points of contact. The result is a
decrease in the rate of osteoclast generation. By the same and other mechanisms,
activity levels and lifespan of existing osteoclasts are reduced. All in all, it is firmly
established that estrogens reduce bone resorption. There are ample indications that
they also directly stimulate bone formation, but there is no consensus regarding the
involved mechanisms.
Follicle stimulating hormone (FSH), the hormone stimulating estrogen production,
has also been found to have a direct effect on bone. It was reported to stimulate
osteoclast activity, an effect that would counter that of thyrotropin. Before
menopause, this effect is more than compensated for by the anabolic actions of
estrogen, but following menopause, it might be responsible for the phase of high-
turnover bone loss.
In males, androgen levels come down only at a later age. As a result, male
osteoporosis manifests itself at least ten years later then in females. Androgen-
dependent mechanisms stimulating bone mass probably overlap to a large extent with
those due to estrogens. Yet, there is a second possibility: also in males, androgens are
being converted to estrogens by the enzyme aromatase, expressed in fatty tissue.
Consequently, it is possible that some of the bone-protective effect of androgens
might in fact be due to estrogens.
2.5 Cortisol and related glucocorticoids
Glucocorticoids affect bone formation as well as bone resorption. Glucocorticoids
inhibit osteoblast function, e. g., by inhibiting transcription of collagen and
osteocalcin genes (this also happens in other tissues: an impairment in collagen
production can sometimes lead to visible striae in skin). Glucocorticoids also reduce
the life span of osteoblasts.
4. Thyroid hormone
GH and IGF-1 are necessary, but not sufficient for bone growth and maintenance of bone mass.
Also necessary are thyroid hormone and, depending on gender, estrogens or androgens.. At
present, the exact molecular mechanisms of their actions can be insufficiently described.
Virtually all tissues express thyroid hormone receptors, and many tissues express receptors for
estrogens and androgens. The three receptor types are related. Along with vitamin D receptor and
glucocorticoid receptor, they are members of the superfamily of nuclear receptors. While other
members of the nuclear receptor superfamily are primarily cytoplasmic, switching to the nucleus
only following ligand binding, the thyroid hormone receptors (α and β) are bound to the DNA no
matter whether ligand is present. In the absence of ligand, they frequently repress transcription
from the respective genes. Triiodothyronine (T3), or to a lesser extent thyroxine binding to the
receptor causes it to actively contribute to transcription initiation. Thyroid hormone receptors are
expressed in chondrocytes, bone marrow stromal cells, osteoblasts and osteoclast precursors. It is
unclear whether T3 has direct actions in osteoclasts. Apart from thyroid hormone itself, the
superordinate controlling hormone thyrotropin (TSH) has been reported to have a direct
inhibiting effect on osteoclasts, which were found to express TSH reporters.
Lack of thyroid hormone in children causes dwarfism. On the other hand, hyperthyroidism
causes secondary osteoporosis.
Parathyroid hormone (PTH) is named for the four parathyroid glands producing it, tiny
epitheloid bodies located right behind the thyroid. An increase in the concentration of free Ca2+
activates the calcium-sensing receptor (CaSR) located at the membrane of their chief cells. The
cells react by decreasing PTH production. A second means to lower PTH secretion is a high
concentration of 1,25 dihydroxyvitamin D. The message of Vitamin D seems to be: "Stop
cannibalizing our bones, I'll organize more Ca2+ from outside in a minute!" PTH is a small
protein of 84 amino acids and has an extremely short half-life of about four minutes. PTH
increases Ca2+ concentration via two main mechanisms: by liberating it from bone and by
influencing the kidneys.
PTH's net effect in bone is an increase in resorption by activation of osteoclasts. This is achieved
via a detour, as osteoclasts do not express PTH receptors. PTH is sensed by osteoblasts, which
react by producing IL‑1, IL‑6 and other cytokines to activate osteoclasts.
Hormon paratiroid ( PTH ) adalah nama untuk empat kelenjar paratiroid memproduksi
itu , badan epitheloid kecil yang terletak tepat di belakang tiroid . Peningkatan konsentrasi
5. Ca2 + gratis mengaktifkan kalsium -sensing receptor ( CASR ) yang terletak di membran
sel utama mereka . Sel-sel bereaksi dengan menurunkan produksi PTH . Sebuah cara
kedua untuk menurunkan sekresi PTH adalah konsentrasi tinggi dari 1,25
dihydroxyvitamin D. Pesan vitamin D tampaknya menjadi : " Hentikan mengorbankan
tulang kita , saya akan mengatur lebih Ca2 + dari luar dalam satu menit! " PTH adalah
protein kecil dari 84 asam amino dan memiliki paruh yang sangat singkat sekitar empat
menit . PTH meningkatkan konsentrasi Ca2 + melalui dua mekanisme utama : dengan
membebaskan dari tulang dan dengan mempengaruhi ginjal .
Efek bersih PTH dalam tulang adalah peningkatan resorpsi oleh aktivasi osteoklas . Hal ini
dicapai melalui jalan memutar , karena osteoklas tidak mengekspresikan reseptor PTH .
PTH dirasakan oleh osteoblas ,