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33 Cards in this Set
- Front
- Back
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name the two gonadotropins
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Follicle Stimulating Hormone (FSH)
and Luteinizing hormone (LH) |
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What secretes gonadotropins?
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Anterior Pituitary
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Receptor proteins for FSH are located exclusively here in males
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Seminiferous tubules specifically the sertoli cells
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where are the FSH receptors confined to in males?
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sertoli cells
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what is the physiological effect of FSH on Sertoli cells?
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stimulates testosterone
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LH receptors are located exclusively in the interstitial tissue on these cells
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Leydig cells
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what are the physiological effects of LH binding to Leydig cells?
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testosterone secretion
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what are the two testicular hormones?
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Testosterone and Inhibin
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Gonadotropin releasing hormone (GnRH) is released from where?
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hypothalamus
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GnRH release stimulates what secretion?
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LH and FSH from the Anterior Pituitary Gland
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what causes follicle to develop?
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FSH
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as the follicle develops what does it secrete?
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Estrogen and some Progesterone
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define endometrium
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the lining of the uterus
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Follicle development leads to what
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thickening of the endometrium
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what stimulates ovulation
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a surge of LH from the Ant. Pit.
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define ovulation
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an egg entering the uterine tubes
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remnants of the follicle remain in the ovary and are then called
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corpus luteum
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what does the corpus luteum secrete?
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progesterone
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what is the effect of progesterone?
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makes the endometrium more vascular and glandular
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High levels of estrogen and progesterone inhibit production of this
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FSH and LH
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what does the inhibition of FSH and LH lead to in females?
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no follicle development
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if no fertilization occurs, decline in estrogen causes _________?
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menstruation
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what is menstruation
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the sloughing off of endometrium
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changes in FSH and LH maintain what cycle?
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ovarian
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hormones produce by the ovaries regulate which cycle?
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Uterine Cycle
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changes in FSH and LH maintain what female cycle?
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ovarian
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hormones produce by the ovaries regulate which cycle?
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Uterine Cycle
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what is the function of LH in males
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stimulates Leydig cells to sectrete andrgoens
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what is the function of FSH in males
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stimulates sertoli cells of testes to promote spermatogenesis
FSH also makes cells receptive to testosterone's stimulatory effect |
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describe inhibin
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a hormone secreted by Sertoli cells that inhibits FSH secretion by the Ant. Pit.
when sperm count is high, inhibin release is increased and it inhibits Ant. Pit. release of FSH and hypothalamic release of GnRH When sperm count falls below 20 million/mL, inhibin secretion declines steeply |
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describe oligospermia
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decreased fertility (less than 20million/mL)
caused by heat, lead or arsenic poisoning, etc. |
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target of FSH in males
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sertoli cells
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describe a vasectomy
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vas deferens cut and tied
doesn't effect T production or sperm production semen consists of glandular secretions but no sperm |
