ANSC 333 Exam 3 (Chp 10
describe the blood hormone concentrations required for spermatogenesis - ANS-GnRH
is a constant pulse (every 4-6hrs) that comes from the tonic center.
GnRH stimulates FSH and LH from AP.
FSH is lower than LH due to inhibin.
Testosterone comes from the Leydig cells from the testicles
Figure 10-3 (title?)
What cells does FSH and LH act on? Explain roles - ANS-Sertoli and Leydig cells
(make testosterone). Leydig cells produce small qantities of aromatase, which converts
testosterone (T) to Estradiol. T can be transported into Sertoli cells, which will be
converted to estradiol (made in both cell types) and dihydrotestosterone (which affects
behavior).
In response to FSH acting on Sertoli cells, inhibin will be made, which causes negative
feedback on AP to stop FSH production. There always needs to be some FSH, because
if there was 0 then spermatogensis will be stopped completely.
how does dihydrotestosterone (DHT), estradiol, and testosterone (T) sffect the brain? -
ANS-all have negative feedback on hypothalamus to suppress GnRH production (to
keep at sufficient rates).
T is metabolized and when the T levels are low, the hypo. produces more from the tonic
center. When T is high it will suppress GnRH and when T is low, GnRH is no longer
blocked.
(fig. 10-4) what are the 7 hormones invovled with (finish this) - ANS-GnRH, FSH, LH,
Testosterone, Inhibin, Estradiol, DHT
Definition of spermatogenesis - ANS-production of male gamete
(figure 10-5 Title) stages of spermatogenesis include - ANS-1. Proliferation= cells are
replicating. 2 key events include Mitotic division and Stem cell Renewal.
Mitotic division is when the A1 spermatogonia undergo multiple rounds of division. Stem
cell renewal is when the ell undergoes mitotic division and then reverts back to become
A1 spermatogonia again (starting over)
describe the blood hormone concentrations required for spermatogenesis - ANS-GnRH
is a constant pulse (every 4-6hrs) that comes from the tonic center.
GnRH stimulates FSH and LH from AP.
FSH is lower than LH due to inhibin.
Testosterone comes from the Leydig cells from the testicles
Figure 10-3 (title?)
What cells does FSH and LH act on? Explain roles - ANS-Sertoli and Leydig cells
(make testosterone). Leydig cells produce small qantities of aromatase, which converts
testosterone (T) to Estradiol. T can be transported into Sertoli cells, which will be
converted to estradiol (made in both cell types) and dihydrotestosterone (which affects
behavior).
In response to FSH acting on Sertoli cells, inhibin will be made, which causes negative
feedback on AP to stop FSH production. There always needs to be some FSH, because
if there was 0 then spermatogensis will be stopped completely.
how does dihydrotestosterone (DHT), estradiol, and testosterone (T) sffect the brain? -
ANS-all have negative feedback on hypothalamus to suppress GnRH production (to
keep at sufficient rates).
T is metabolized and when the T levels are low, the hypo. produces more from the tonic
center. When T is high it will suppress GnRH and when T is low, GnRH is no longer
blocked.
(fig. 10-4) what are the 7 hormones invovled with (finish this) - ANS-GnRH, FSH, LH,
Testosterone, Inhibin, Estradiol, DHT
Definition of spermatogenesis - ANS-production of male gamete
(figure 10-5 Title) stages of spermatogenesis include - ANS-1. Proliferation= cells are
replicating. 2 key events include Mitotic division and Stem cell Renewal.
Mitotic division is when the A1 spermatogonia undergo multiple rounds of division. Stem
cell renewal is when the ell undergoes mitotic division and then reverts back to become
A1 spermatogonia again (starting over)
