click below
click below
Normal Size Small Size show me how
endocrinology -
endocrinology - Famous glands
Question | Answer |
---|---|
what are the types of hormones that produced by hypothalamus ? | a)Releasing hormones stimulate the anterior pituitary (adenohypophysis) to secrete hormones. (5hormones).. b) Release inhibiting hormones prevent the anterior pituitary from secreting hormones. (2hormones).. |
name the hypothalamic release inhibiting hormones !! | 1- Somatostatin ; 2- Prolactin release inhibiting hormone-PIH( dopamine) |
name the hypothalamic releasing hormones !! | 1. Thyrotropin releasing hormone-TRH 2. Growth hormone releasing hormone-GHRH 3. Gonadotropin releasing hormone GnRH 4. Corticotropin releasing hormone CRH 5. Prolactin releasing hormone/s( peptides) |
Why is the Hypothalamus so Important? | 1. Secretes regulatory hormones (RH, RIH) ; 2. "Directs" pituitary |
how many hormones are secreted by pituitary gland? | 9 hormones ( 7 hormones by the anterior part and 2 hormones by the posterior part). |
name anterior pituitary hormones! | 1. Growth hormone (GH); 2.Prolactin (PRL); 3.Gonadotropins; 4.Thyroid-stimulating hormone (TSH); 5.Adrenocorticotropic hormone (ACTH); 6.Melanocyte-stimulating hormone (MSH); 7.Endorphins |
name posterior pituitary hormones! | 1.Oxytocin ; 2.Antidiuretic hormone (ADH) |
GH | Growth hormone(GH):a protein. secreted by anterior pituitary. Secretion regulated by hypothalamic hormones. Stimulates growth and metabolism. Acts directly on tissues or acts via growth factors. (abnormalities: Gigantism,Acromegaly,Hypopituitary dwarfism) |
Hypopituitary dwarfism | childhood GH deficiency. hypopituitarism during childhood growth inhibition sexual immaturity (decrease sex hormones) |
Gigantism | excessive GH during development. acidophilic tumor increase GH before adolescence epiphyses not closed; growth to >8ft |
Acromegaly | excessive GH production during adulthood. enlargement of soft tissue after adolescence, e.g. lower jaw bone |
PRL | Prolactin (PRL): a protein. secreted by anterior pituitary. this secretion regulated by hypothalamic hormones. Stimulates milk production and secretion from mammary gland. |
Gonadotropins | Gonadotropins(Gonotropic):glyocoproteins.secreted by anterior pituitary.Secretion regulated by hypothalamic hormones. 1.Follicle-stimulating hormone (FSH). Stimulates production of sperms and ova. 2.Luteinizing hormone (LH). Stimulates ovaries and testes. |
TSH | Thyroid-stimulating hormone (TSH): a glycoprotein. secreted by anterior pituitary. Secretion regulated by hypothalamic hormones and thyroxine in blood. Stimulates thyroid gland. |
ACTH | Adrenocorticotropic hormone (ACTH): a peptide. secreted by anterior pituitary. Secretion regulated by glucocorticoids and hypothalamic hormones. Stimulates adrenal cortex secretion of glucocorticoids |
MSH | Melanocyte-stimulating hormone (MSH): a peptide. secreted by anterior pituitary. May play a role in fat metabolism. |
Endorphins | Endorphins: peptides. secreted by anterior pituitary. Inhibit pain perception. Effects mimicked by heroin and other opiate drugs. |
Oxytocin | Oxytocin: a peptide. secreted by posterior pituitary. Secretion regulated by the nervous system. Stimulates contraction of the uterus and mammary glands ( lactation). |
ADH | Antidiuretic hormone (ADH): a peptide. secreted by posterior pituitary. Secretion regulated by water/salt balance. Promotes retention of water by the kidneys (in Kidney tubules). High level decreases urination and vice versa. |