anterior pituitary gland वाक्य
उदाहरण वाक्य
मोबाइल
- Stress induces a release of corticotropin-releasing hormone ( CRH ) and vasopressin from the hypothalamus, which activates the release of adrenocorticotropic hormone ( ACTH ) from the anterior pituitary gland.
- Following secretion, TRH travels across the median eminence to the anterior pituitary gland via the hypophyseal portal system where it stimulates the release of thyroid-stimulating hormone from cells called thyrotropes.
- Glucocorticoids act to inhibit feedback of both the hypothalamus, decreasing corticotropin-releasing hormone [ CRH ], and corticotrophs in the anterior pituitary gland, decreasing the amount of adrenocorticotropic hormone [ ACTH ].
- This pathway is part of a closed-loop feedback process : Elevated concentrations of T 3, and T 4 in the blood plasma inhibit the production of TSH in the anterior pituitary gland.
- Kisspeptin is a protein that regulates the release of GnRH from the hypothalamus, which in turn regulates the release of LH and to a lesser extent, FSH from the anterior pituitary gland.
- The Rathke s pouch, a cavity of ectodermal cells of the oropharynx, forms between the fourth and fifth week of gestation and upon full development, it gives rise to the anterior pituitary gland.
- Less common causes include : previous treatment with radioactive iodine, injury to the hypothalamus or the anterior pituitary gland, certain medications, a lack of a functioning thyroid at birth or previous thyroid surgery.
- Hormonal output from the thyroid is regulated by thyroid-stimulating hormone ( TSH ) secreted from the anterior pituitary gland, which itself is regulated by thyrotropin-releasing hormone ( TRH ) produced by the hypothalamus.
- As concentrations of these hormones decrease, the anterior pituitary gland increases production of TSH, and by these processes, a feedback control system stabilizes the amount of thyroid hormones that are in the bloodstream.
- Her paper, published in the journal Endocrinology in 1982, suggested that the hormone might have an effect on the anterior pituitary gland in mammals, which helps to regulate growth and ovulation, among other things.
- Harris, the Dr . Lee's Professor of Anatomy at Oxford University, is credited with showing that the anterior pituitary gland of mammals is regulated by hormones secreted by hypothalamic neurons into the hypothalamohypophysial portal circulation.
- GnRH is released from the hypothalamus in a pulsatile manner at set intervals throughout the day via the hypophyseal portal system and acts on the anterior pituitary gland, causing it to release two hormones called gonadotropins.
- GnRH stimulates the release of FSH and LH from the anterior pituitary gland that will later have a stimulatory effect on follicle growth ( not immediately, however, because only antral follicles are dependent on FSH and LH ).
- :; Tactile responding : It has been shown that infant mice who were stroked with a paintbrush ( simulating motherly care ) had more release and binding of growth hormone ( GH ) from the anterior pituitary gland.
- The use of the term hypogonadotropic relates to the fact that the hypogonadism found in HH is caused by a disruption in the production of the gonadotropin hormones normally released by the anterior pituitary gland known as luteinising hormone ( LH ) and follicle stimulating hormone ( FSH ).
- By contrast, the hormones of the anterior pituitary gland ( the adenohypophysis ) are secreted from endocrine cells that, in mammals, are not directly innervated, yet the secretion of these hormones ( adrenocorticotrophic hormone, luteinizing hormone, follicle-stimulating hormone, thyroid-stimulating hormone, prolactin, and growth hormone ) remains under the control of the hypothalamus.
- The high levels of TSH are because the thyroid won't respond to normal levels, so the anterior pituitary gland, sensing a lack of T3 and T4, keeps making TSH . When too much T3 and T4 are made, the pituitary gland is inhibited, so no more TSH is made, so levels are low.
- :: : " Popular misconceptions " " It is likely that this myth came from the real side effect of anabolic steroids known as testicular atrophy, in which the use of anabolic steroids causes reduced secretion of the gonadotropin luteinizing hormone and follicle stimulating hormone from the anterior pituitary gland, thus reducing testicle size.
- If the increase in serum TSH level following TRH administration is absent or very slight, then the cause of the hypothyroidism is in the anterior pituitary gland, i . e . the pituitary is not secreting TSH . Therefore, even when TRH is given exogenously, TSH levels do not rise as the pituitary is diseased.
- However, the introduction of cadmium into aquatic systems has been shown to disrupt normal operation of the adrenal gland in amphibians and result in a marked drop in ACTH ( a hormone secreted by the anterior pituitary gland which triggers an increase in production of corticosterone ) and therefore also a drop in corticosterone production.
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