hormone /hor·mone/ (hor´mōn) a chemical substance produced in the body which has a specific regulatory effect on the activity of certain cells or a certain organ or organs.hormo´nal
Luteinizing hormone (LH)
luteinizing hormone (LH)
luteinizing hormone
adrenocortical hormone
1. any of the corticosteroids elaborated by the adrenal cortex, the major ones being the glucocorticoids and mineralocorticoids, and including some androgens, progesterone, and perhaps estrogens.
2. corticosteroid.
adrenocorticotropic hormone (ACTH) corticotropin.
adrenomedullary hormones substances secreted by the adrenal medulla, including epinephrine and norepinephrine.
androgenic hormone androgen.
anterior pituitary hormones those produced in the adenohypophysis (anterior pituitary), including corticotropin, follicle-stimulating hormone, growth hormone, luteinizing hormone, prolactin, and thyrotropin.
antidiuretic hormone vasopressin.
cortical hormone adrenocortical h.
corticotropin-releasing hormone (CRH) a neuropeptide elaborated mainly by the median eminence of the hypothalamus, but also by the pancreas and brain, that stimulates the secretion of corticotropin.
ectopic hormone one released from a neoplasm or cells outside the usual source of the hormone.
eutopic hormone one released from its usual site or from a neoplasm of that tissue.
fibroblast growth hormone a peptide hormone secreted by the adenohypophysis that is a potent mitogen of vascular endothelial cells and a regulator of tissue vascularization.
follicle-stimulating hormone (FSH) one of the gonadotropic hormones of the adenohypophysis; it stimulates ovarian follicle growth and maturation, estrogen secretion, and endometrial changes characteristic of the first portion of the menstrual cycle in females, and stimulates spermatogenesis in males.
follicle-stimulating hormone–releasing hormone (FSH-RH) luteinizing hormone
gonadotropic hormone gonadotropin.
gonadotropin-releasing hormone (Gn-RH)
2. any hypothalamic factor that stimulates release of both follicle-stimulating hormone and luteinizing hormone.
growth hormone (GH) any of several related hormones secreted by the adenohypophysis that directly influence protein, carbohydrate, and lipid metabolism and control the rate of skeletal and visceral growth; used pharmaceutically as somatrem and somatropin.
growth hormone–releasing hormone (GH-RH) one elaborated by the hypothalamus, stimulating release of growth hormone from the adenohypophysis.
inhibiting hormones hormones elaborated by one body structure that inhibit release of hormones from another structure; applied to substances of established clinical identity, while those whose chemical structure is still unknown are called inhibiting factors.
interstitial cell–stimulating hormone luteinizing h.
lactation hormone , lactogenic hormone prolactin.
local hormone a substance with hormonelike properties that acts at an anatomically restricted site.
luteinizing hormone (LH) a gonadotropin of the adenohypophysis, acting with follicle-stimulating hormone in females to promote ovulation as well as secretion of androgens and progesterone. It instigates and maintains the secretory portion of the menstrual cycle and is concerned with corpus luteum formation. In males, it stimulates the development and functional activity of testicular Leydig cells.
luteinizing hormone–releasing hormone (LH-RH) a glycoprotein gonadotropic hormone of the adenohypophysis that acts with follicle-stimulating hormone to promote ovulation and promotes secretion of androgen and progesterone. A preparation of the salts is used in the differential diagnosis of hypothalamic, pituitary, and gonadal dysfunction and in the treatment of some forms of infertility and hypogonadism.
melanocyte-stimulating hormone , melanophore-stimulating hormone (MSH) one of several peptides secreted by the anterior pituitary in humans and in the rhomboid fossa in lower vertebrates, influencing melanin formation and deposition in the body and causing color changes in the skin of amphibians, fishes, and reptiles.
neurohypophysial hormones posterior pituitary h's.
parathyroid hormone a polypeptide hormone secreted by the parathyroid glands, which influences calcium and phosphorus metabolism and bone formation.
placental hormones those produced by the placenta during pregnancy, including chorionic gonadotropin and other substances having estrogenic, progestational, or adrenocorticoid activity.
plant hormone phytohormone.
posterior pituitary hormones those released from the neurohypophysis (posterior pituitary), including oxytocin and vasopressin.
progestational hormone
1. progesterone.
2. see under agent.
releasing hormones hormones elaborated in one structure that cause the release of hormones from another structure; applied to substances of established chemical identity, while those whose chemical structure is unknown are called releasing factors.
somatotrophic hormone , somatotropic hormone growth h.
somatotropin-releasing hormone (SRH) growth hormone
steroid hormones those that are biologically active steroids; they are secreted by the adrenal cortex, testis, ovary, and placenta and include the progestogens, glucocorticoids, mineralocorticoids, androgens, and estrogens.
thyroid hormones thyroxine, calcitonin, and triiodothyronine; in the singular, thyroxine and/or triiodothyronine.
thyroid-stimulating hormone (TSH), thyrotropic hormone thyrotropin.
thyrotropin-releasing hormone (TRH) a tripeptide hormone of the hypothalamus, which stimulates release of thyrotropin from the adenohypophysis and also acts as a prolactin-releasing factor. It is used in diagnosis of mild hyperthyroidism and Graves' disease, and in differentiating among primary, secondary, and tertiary hypothyroidism. A synthetic preparation is called protirelin.
lu·te·in·iz·ing hormone (l  t - -n  z ng)n. Abbr. LH A hormone produced by the anterior lobe of the pituitary gland that stimulates ovulation and the development of the corpus luteum in the female and the production of testosterone by the interstitial cells of the testis in the male. Also called interstitial cell-stimulating hormone, lutropin. |
Luteinizing hormone (LH)
A hormone secreted by the pituitary gland that regulates the menstrual cycle and triggers ovulation in females. In males it stimulates the testes to produce testosterone.
luteinizing hormone (LH)
[lo̅o̅′tē·inī′zing]
Etymology: L, luteus, yellow; Gk, izein, to cause, hormein, to begin activity
a glycoprotein hormone produced by the anterior pituitary gland. It stimulates the secretion of sex hormones by the ovary and the testes and is involved in the maturation of spermatozoa and ova. In men, it induces the secretion of testosterone by the interstitial cells of the testes. Testosterone, together with follicle-stimulating hormone (FSH), induces the maturation of seminiferous tubules and stimulates them to produce sperm. In females, LH, working together with FSH, stimulates the growing follicle in the ovary to secrete estrogen. High concentrations of estrogen stimulate the release of a surge of LH, which stimulates ovulation. LH then induces the development of the ruptured follicle into the corpus luteum, which continues to secrete estrogen and progesterone. The normal LH concentration in the plasma of men is less than 11 mIU/mL. In premenopausal women it is less than 25 mIU/mL; at midcycle peak it is greater than three times the baseline concentration; in postmenopausal women it is more than 25 mIU/mL. See also interstitial cell-stimulating hormone, menstrual cycle.
luteinizing hormone
a gonadotropic hormone of the anterior pituitary gland, acting with follicle-stimulating hormone to cause ovulation of mature follicles and secretion of estrogen by thecal and granulosa cells of the ovary; it is also concerned with corpus luteum formation. In the male, it stimulates development of the interstitial cells of the testes and their secretion of testosterone. Abbreviated LH. Called also interstitial cell-stimulating hormone.
luteinizing hormone releasing hormone (LH-RH)
a hormone secreted by the hypothalamus that, together with a release-inhibiting factor, controls the secretion of, for example, the luteinizing hormone of the adenohypophysis. Called also Gn-RH.
luteinizing hormone
Interstitial cell stimulating hormone A glyocoprotein hormone/gonadotropin secreted by the anterior pituitary which, in ♀, is secreted cyclically, as is FSH; the cyclic release of LH–and FSH–is
responsible for ovulation and transforms the ovarian/graafian follicle into a corpus luteum, which produces progesterone and estrogens; episodic LH release is linked to milk production; in ♂, continuous LH release stimulates testosterone
release from the testes; LH and FSH act in concert to stimulate and maintain spermatogenesis; LH and FSH are measured for infertility in ♀, and testicular dysfunction in ♂. Cf FSH.
How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
| ?Page tools | ||
|---|---|---|
|