Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
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
|
