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The pituitary gland (or hypophysis) is an endocrine gland about the size of a pea and weighing 0.5 grams (0.018 oz) in humans. It is a protrusion off the bottom of the hypothalamus at the base of the brain, and rests in a small, bony cavity (sella turcica) covered by a dural fold (diaphragma sellae).
adrenal glands, gonads: AR: Substrate for estrogen: Dihydrotestosterone: androgen: DHT: multiple: AR: 5-DHT or DHT is a male reproductive hormone that targets the prostate gland, bulbourethral gland, seminal vesicles, penis and scrotum and promotes growth/mitosis/cell maturation and differentiation.
The adrenal glands measure approximately 5 cm in length, 3 cm in width, and up to 1 cm in thickness. [9] Their combined weight in an adult human ranges from 7 to 10 grams. [10] The glands are yellowish in colour. [8] The adrenal glands are surrounded by a fatty capsule and lie within the renal fascia, which also
It is also released directly into the bloodstream by the adrenal glands. Regardless of how and where it is released, norepinephrine acts on target cells by binding to and activating adrenergic receptors located on the cell surface. A variety of medically important drugs work by altering the actions of noradrenaline systems.
Abel claimed his principle from adrenal gland extract was active. In 1900, Jōkichi Takamine (1854–1922), a Japanese chemist, worked with his assistant, Keizo Uenaka (1876–1960), to purify a 2000 times more active principle than epinephrine from the adrenal gland, named adrenaline with the molecular formula C 10 H 15 NO 3.
Electrical impulses carried by the sympathetic nervous system are converted to a chemical response in the adrenal gland. Chromaffin cells contained in the adrenal medulla act as postganglionic nerve fibers that release this chemical response into the blood as a circulating messenger. The sympathoadrenal system can activate and discharge ...
One of the most important functions of the hypothalamus—it is located in the brain adjacent to the pituitary gland—is to link the endocrine system to the nervous system via the pituitary gland.) Other organs, such as the kidneys , also have roles within the endocrine system by secreting certain hormones.
It is one of the most abundant circulating steroids in humans. [5] DHEA is produced in the adrenal glands, [6] the gonads, and the brain. [7] It functions as a metabolic intermediate in the biosynthesis of the androgen and estrogen sex steroids both in the gonads and in various other tissues.
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