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What is the feedback loop between the anterior pituitary and the production of testosterone in the testis?
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What turns off FSH?
Estrogen production from the Graafian Follicle gradually reduces FSH release from the Anterior Pituitary via negative feedback.
How is androgen production controlled?
LH triggers the interstitial cells of the testes to produce testosterone. Testosterone levels are are measured by the pituitary gland and if the levels are high enough, the pituitary gland shuts off the secretion of LH. Its a process called negative feedback.
Exert negative feedback on the anterior pituitary relative to fsh secretion?
Estrogen and progesterone.
The surge in LH secretion from the anterior pituitary that causes ovulation can be partially explained by the?
positive feedback of estradiol that increases the release of LH
Does a low pH exert a negative feedback action on the production of cholecystokinin or on the production of gastrin?
Some pituitary hormones have a negative
Which hormone triggers spermatogenesis?
The major hormones in the male reproductive system are:1. Gonadotropin Releasing Hormone (GnRH) is mainly made in the hypothalamus from where it travels to the pituitary gland where it stimulates the synthesis and secretion of the gonadotropins which are follicle-stimulating hormone and luteinizing hormone.2. Follicle Stimulating Hormone (FSH) is released by the anterior pituitary gland. It is necessary for the maturation of spermatozoa.3. Luteinizing Hormone (LH) is released by the anterior pituitary gland. In the testes, LHstimulates the synthesis and secretion of testosterone. It also stimulates the testes to produce the hormone androgen.4. Testosterone is made in the interstitial cells. It stimulates the sex drive.5. Inhibin is made by the Sertoli cells when they are low in nutrients in order to feed developing sperm cells. It acts as a negative feedback, going to the brain to slow the release of FSH and GnRH.
What controls other glands and body growth?
The pituitary gland (anterior) is responsible for secretion of GH. Regulation is via the negative feedback system's Hypothalamus, running through the hypothalamic nerve, at the top of the gland.
What roles does estrogen play in the in the feedback mechanism?
Gonadotropin-releasing hormone (GnRH) is a neurohormone secreted by the preoptic nuclei of the hypothalamus. This hormone causes leuteinizing hormone to be released by the anterior pituitary. LH works its way through the bloodstream to the ovaries, which produce estrogen. Estrogen has a feedback loop with both the hypothalamus and the anterior pituitary. Whether the mechanism is positive or negative depends. In ovulation, this mechanism is positive, so high estrogen levels will induce even higher LH levels.
What releases TSH?
TSH is inhibited by feedback inhibition exerted by the thyroid hormones on the anterior pituitary and hypothalamus and by GHIH.
What are most hormone action regulated by?
The hypothalamus regulates the Pituitary gland, and the Pituitary gland regulates the rest of the endocrine system.
What does the pituary gland regulate?
The other way around. The pituitary is in charge. But there is feedback : adrenals to hypothalamus to pituitary to adrenals.
What hormone stimulates the release of luteinizing hormone by the anterior pituitary?
The hypothalamus releases GnRH (gonadotropin-releasing hormone) which stimulates the anterior pituitary gland to release LH (luteinizing hormone) and FSH (follicle-stimulating hormone). GnRH stimulates the LH burst in response to positive feedback from increasing estrogen levels.fsh is secreted by anterior pituitary which triggers the growth of 6-12 follicles each cycle.
