Reproductive Physiology
Terms
undefined, object
copy deck
- How often are GnRH pulses released in males?
- every 90-120 minutes
- What inhibits GnRH relase?
-
Testosterone
Estradiol - What do Leydig cells do?
-
Found between Seminiferous Tubules
Stimulated by LH
Release Testosterone
Inhibited by Estradiol/Testosterone - What do Sertoli cells do?
-
Stimulated by FSH
Spermatogenesis
Inhibited by Inhibin and Testosterone - What does T. do in fetal testis?
-
Differentiation of Wolffian ducts
Conversion to DHT - What does T. do age 3-6 months?
- Priming of penile, prostatic, testicular growth
- What does T. do at puberty?
-
Secondary sexual characteristics
Caps epiphyses - Name the stages of Spermatogenesis and the # of chromosomes at each step.
-
Spermatogonia (46)
Primary spermatocytes (92)
Secondary spermatocytes (46)
Round Spermatids (23)
Spermatozoa (23) - How long does it take to get from Spermatogonia to Spermatozoa?
- 64-74 days.
- Where is sperms' motility acquired?
- as it travels through epididymis
- What are the two phases of the menstrual cycle called?
-
1-14: Follicular
15-28: Luteal - What effect does estradiol produced during the follicular phase have?
- negative feedback to AP
- What effect does estradiol produced during midcycle have?
- Positive feedback to AP
- What effect does progesterone produced during the luteal phase have?
- Negative feedback to AP
- When is the highest period of progesterone release during the menstrual cycle?
- five days after ovulation (time of implantation)
- When does HCG secretion begin?
- eight days after ovulation (implantation has occured)
- What converts Testosterone to Dihydrotestosterone
- 5alpha-reductase