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16 Cards in this Set
- Front
- Back
Thyrotropin; thyroid stimulating hormone (TSH)
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- produced by anterior pituitary
- glycoprotein with α and ß subunits, 28 kD - Stimulates growth of thyroid gland, TH production and release - stiumlates iodine uptake, iodination, pinocytosis of colloid |
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Follicle stimulating hormone (FSH)
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- produced by anterior pituitary
- glycoprotein with α and ß subunits, 29 kD - Stimulates ovarian follicle development / spermatogenesis - gets sertoli cells (do spermogenesis) - gets granulosa cells to convert androgens to estrogens - inhibin inhibits (via AP) |
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Luteinizing hormone
(LH) |
- produced by anterior pituitary
- glycoprotein with α and ß subunits, 29 kD - Causes ovulation and production corpus luteum / sex steroid synthesis - gets leydig cells to make testosterone (testosterone inhibits via GnRH) - gets thecal cells which make androgens |
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Growth hormone (GH),
somatotropin |
- produced by anterior pituitary
- 191 amino acids, 22 kD - Stimulates body growth, organ growth and regulates metabolism - via stiumlating IGF-1 in liver and lipolysis, decresing glucose use - GHRH increases, SS decreases - IGF-1 increases SS and decreases GHRH |
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Gonadotropin releasing hormone (GnRH)
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- 10 aa
- acts on gonadotrophs (LH and FSH) - stimulatory - pulsular (1 pulse/hr) - works more on LH b/c FSH has other controling factors - more as you mature |
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Leydig cells
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- abundant in newborn's and post-pubertal and scattered in CT
- make testosterone via LH stimulation of cAMP -> cholestrol estrase -> testosterone - testosterone receptors in sertoli cells and T->estradiol to do something in the s cells |
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Sertoli Cells
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- surround semineferous tubules - do proliferation bustst in newborn and just before puberty
- FSH induces p450 acromatase activity to increase proliferation and binding protein production (to store androgens) - sperm count increases inhibin and decreases FSH |
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follicular stages
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primordial - inactive
1o - single granulosa layer 2o - multiple granulosa layers and thecal cells 3o - more granuulosa and thecal Preovulatory - full of follicular fluid atretic - |
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ovarian cycle
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- after 1o need Gn
- 3 wks to 2o - to 3o right after menses - advance stages need more LH and less FSH - late stage - LH maintenance combined w/ granulosa making P causes high estrogens and + feedback -> FSH and LH surge -> ovulation - luteal phase - CL increases 17-OH P which decreases FH and LSH |
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endometrial cycle
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- start prolif on day 5 (secretory galnds, vacularization, cervix mucus)
- E causes P receptors in uterus - when CL does 17-OH P, secretory phase (more vasc, less mucous) - menstruation when E, P, FSH, LH decrease and spiral arteries constrict and BV rupture |
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Thyroid Hormone
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- T3 and T4
- stimuate GH expression in somatotrophs and AP - brain development timing - reulate ox. phos. - do (-) feedback on TSH by decreaseing TRH sensitvity and gene expressing of a and b for TSH - 70% bound to liver glycoprotein, the rest bound to albumin - 5' deoidinase does t4 -> T3 |
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parathyroid hormone
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- increase Ca and decrease Ph
- increases kidney resoption - increases D3 sythesis - increases osteocasts and inhibits osteoblasts - increases GI uptake |
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important D3 formation
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- D3 to 25-OH-D3 in liver
- 25-OH-D3 to 1,25(OH)2-D3 in kidney (active) - it increase Ca binding protein in GI epi |
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hCS
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- lactogen, incresas until term
- decrases maternal glucose consumption, increases fat metab - helps w/ mammary cells |
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DHEA-S
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- made in fetal andrenal gland
- converted to estradol and strone by sufatase in placenta - converted to estriol (most imp) in fetal liver |
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maternal changes in pregnancy
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- Increase E -> increase prolactin
- increase pitutary - decreased LH and FSH - total Ca decreases, but ionized increase b/c of PTH - TH increases - P increases fat along w/ GH, prolacin and hCS (decrease glucsoe, increase GN) |