, a neurotransmitter in the catecholamine family that mediates chemical communication in the sympathetic nervous system, a branch of the autonomic nervous system. Click the link for more information. and norepinephrine norepinephrine Epinephrine, a catecholamine, together with norepinephrine, is secreted principally by the medulla of the adrenal gland. , hormone important to the body's metabolism, also known as adrenaline. The adrenal medulla secretes epinephrine epinephrine It has been purified extensively and appears to be a protein containing 84 amino-acid residues, a sequence of which Click the link for more information. and calcitonin, and the parathyroids secrete parathyroid hormone parathyroid hormoneĪ hormone secreted by the parathyroid glands that regulates the metabolism of calcium and phosphate in the body. Complexed to a protein, it is stored in the follicle stems between thyroid cells. The hormone thyroxine forms by combining the amino acid tyrosine with iodine. , substance secreted by the thyroid gland. The structure of oxytocin, a cyclic peptide consisting of nine amino acids, was determined in 1953 and in the same year it was , hormone released from the posterior lobe of the pituitary gland that facilitates uterine contractions and the milk-ejection reflex. Click the link for more information., prolactin, and oxytocin oxytocin Antidiuretic hormone (ADH), known also as vasopressin, causes the kidneys to resorb water directly from the Its principal action is to regulate the amount of water excreted by the kidneys. , polypeptide hormone secreted by the posterior pituitary gland. the posterior pituitary secretes antidiuretic hormone antidiuretic hormone , glycoprotein hormone released by the anterior pituitary gland that is necessary for normal skeletal growth in humans (see protein). Click the link for more information., and growth hormone growth hormone Click the link for more information., the gonadotropic hormones gonadotropic hormoneĪny one of three glycoprotein (see protein) hormones released by either the anterior pituitary gland or the placenta (the organ in which maternal and fetal blood exchange nutrients and waste products) that have various effects upon Its chief function is to stimulate the cortex of the adrenal gland to secrete adrenocortical steroids, chief among them cortisone. , polypeptide hormone secreted by the anterior pituitary gland. Click the link for more information., adrenocorticotropic hormone adrenocorticotropic hormone
The release of thyrotropin is triggered by the action of thyrotropin-releasing factor (TRF), a substance found in (TSH), hormone released by the anterior pituitary gland that stimulates the thyroid gland to release thyroxine.
The hormones of the anterior pituitary include thyrotropin thyrotropin As lack of any one of them may cause serious disorders, many hormones are now produced synthetically and used in treatment where a deficiency exists. Click the link for more information.), including the pituitary, thyroid, parathyroids, adrenals, ovaries, testes, pancreatic islets, certain portions of the gastrointestinal tract, and the placenta, among the mammalian species. , body control system composed of a group of glands that maintain a stable internal environment by producing chemical regulatory substances called hormones.
Normally, various hormones are produced and secreted by the endocrine glands (see endocrine system endocrine system Hormone, secretory substance carried from one gland or organ of the body via the bloodstream to more or less specific tissues, where it exerts some influence upon the metabolism of the target tissue.
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