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POMC, ACTH and β-lipotropin are secreted from corticotropic cells in the anterior lobe (or adenohypophysis) of the pituitary gland in response to the hormone corticotropin-releasing hormone (CRH) released by the hypothalamus. [3] The pre-pro-opiomelanocortin is the precursor of POMC, its cleavage forms POMC. [4]
The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol. [1] [2] They are found above the kidneys. Each gland has an outer cortex which produces steroid hormones and an inner medulla.
The secretion of aldosterone is also stimulated by adrenocorticotropic hormone (ACTH). [8] The cells of the zona glomerulosa do not express 11β-hydroxylase and 17α-hydroxylase. This is the reason zona glomerulosa cannot synthesize cortisol, corticosterone or sex hormones . [9]
Constituent cells are organized into bundles or "fascicles". The zona fasciculata chiefly produces glucocorticoids (mainly cortisol in humans), which regulate the metabolism of glucose. Glucocorticoid production is stimulated by adrenocorticotropic hormone (ACTH) [ 1 ] , which is released from the anterior pituitary , especially in times of ...
The thyroid secretes thyroxine, the pituitary secretes growth hormone, the pineal secretes melatonin, the testis secretes testosterone, and the ovaries secrete estrogen and progesterone. [ 2 ] Glands that signal each other in sequence are often referred to as an axis, such as the hypothalamic–pituitary–adrenal axis .
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).
The endocrine system is a network of glands and organs located throughout the body. It is similar to the nervous system in that it plays a vital role in controlling and regulating many of the body's functions. Endocrine glands are ductless glands of the endocrine system that secrete their products, hormones, directly into the blood.
Corticotropes produce and release ACTH, a 39 amino acid peptide hormone, in response to corticotropic releasing hormone (CRH) release from the hypothalamus. CRH is a 41-amino-acid peptide hormone that is secreted by the parvocellular neurosecretory cells, which are found within the paraventricular nucleus of the hypothalamus. [9]