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TAMU ANSC 333 Exam 3 Questions & answers with Complete solutions | Latest edition
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TAMU ANSC 333 Exam 3Tonic center of the hypothalamus; every 4-6 hours - ANS-Where does GnRH come from
within the brain in males? What is the frequency of the pulses?
Testosterone - ANS-When looking at LH, there is a corresponding pulse of what other
hormone?
Leydig cells (interstitial cells) - ANS-Where is testosterone synthesized?
He does not because he lacks the testosterone - ANS-Would a castrated male still have
the sexual behavior/secondary male characteristics? Why or why not?
Sertoli cells - ANS-In males FSH acts on which cells?
aromatase - ANS-Leydig cells produce small quantities of ________ resulting in small
qualities of estradiol to be in circulation.
estradiol and dihydrotestosterone - ANS-Testosterone can be transported into sertoli
cells, which can convert it to ________ or _________, which is a "more potent version."
Inhibin; because without FSH, spermatogenesis would fail - ANS-Sertoli cells will make
______, which has negative feedback to suppress FSH secretions. However, we still get
minimal FSH secretions. Why?
constant and continuous - ANS-What is a good way to describe the pattern of male
hormone production?
Testosterone, Estradiol, Dihydrotestosterone - ANS-What 3 hormones are released from
the testes and all have negative feedback effects on GnRH production?
Every hormone is metabolized and broken down to be utilized. Once testosterone is
utilized, its levels result in going down. The body recognizes it needs to increase the
levels again. This creates a new wave of testosterone. Testosterone inhibits GnRH,
therefore once testosterone is low, GnRH pulses, releasing LH, and pulsing
Testosterone. - ANS-Describe why there is pulsation of testosterone within the male
body.
, GnRH, LH, FSH, Testosterone, Inhibin, Estradiol, and Dihydrotestosterone. - ANS-What
are the 7 male hormones produced?
Testes - ANS-Where are all germ cells/gametes produced?
Proliferation, meiosis, differentiation - ANS-What are the 3 different stages of
spermatogenesis?
Proliferation - ANS-Which stage of spermatogenesis are cells undergoing mitotic
replication, even though they are gametes? A1 ends up being 32B spermatogonia.
Sperm Cell Renewal - ANS-spermatogonia stem cells can only choose to be a sperm
cell. One or some of these cells which have already begun division can start over and
"revert" back to become an A1 spermatogonia again.
61 days - ANS-In the bull, to get from A1 to end/release of the sperm, how many days is
the process?
Meiosis - ANS-Which process involves the 32B spermatogonia entering splitting their
DNA chromosomes ending with 256 sperm? Transforms from spermatogonia to
spermatocyte (primary to secondary).
crossing over - ANS-Why are all sperm unique and not clones?
Differentiation - ANS-Which stage of spermatogenesis involves the cell making
"decisions" to obtain functional competence? This happens in every cell in the body.
Transforms from spermatocyte to spermatid.
Golgi Phase, Cap Phase, Acrosomal Phase, Maturation Phase - ANS-What are the 4
stages of differentiation?
Golgi phase - ANS-Which phase of sperm differentiation involves the golgi apparatus
creating an acrosomic granule on top of the nucleus. (becomes the tail).
cap phase - ANS-Which phase of differentiation in spermatogenesis puts a cap on the
nucleus? Centrioles form the axon to ultimately be the tail.
acrosomal phase - ANS-Which phase of differentiation involves the shape of the
nucleus changing from a large and round shape to gain functionality. Male is producing
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