REPRODUCTIVE PHYSIOLOGY FINAL EXAMQUESTIONSAND ANSWERS LATEST UPDATE 2024/2025 ALLANSWERS 100% CORRECT DETAILED BESTSOLUTIONGRADED A+ FOR EXCELLENT PASS
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REPRODUCTIVE PHYSIOLOGY
REPRODUCTIVE PHYSIOLOGY FINAL EXAMQUESTIONSAND ANSWERS LATEST UPDATE 2024/2025 ALLANSWERS 100% CORRECT DETAILED BESTSOLUTIONGRADED A+ FOR EXCELLENT PASSIt would affect spermatogenesis because with chronic and high levels of LH, Leydigcells become refractory and develop low LH receptivity. There wou...
REPRODUCTIVE PHYSIOLOGY FINAL EXAM QUESTIONS
AND ANSWERS LATEST UPDATE 2024/2025 ALL
ANSWERS 100% CORRECT DETAILED BEST SOLUTION
GRADED A+ FOR EXCELLENT PASS
It would affect spermatogenesis because with chronic and high levels of LH, Leydig
cells become refractory and develop low LH receptivity. There would be a severe
down regulation of the GnRH and LH feedback system. As a result, testosterone
secretion and spermatogenesis would essentially stop. - CORRECT ANSWERS
How would exogenous anabolic steroids (i.e., androgens) affect spermatogenesis?
Why?
There would be no immediate impact on serum concentrations. In about 24-48 hours,
the body will regulate itself back to normal and produce hormones. However, there
will be a loss of negative feedback in the long term, resulting in a decrease in LH and
testosterone. - CORRECT ANSWERS If one testis was removed from a bull, what
would be the immediate effect on serum concentrations of testosterone and LH?
What would be the long term effect?
Sertoli cells are located inside seminiferous tubules, whereas Leydig cells are
located in between the seminiferous tubules. - CORRECT ANSWERS What is the
location and nature of the Sertoli cells and Leydig cells?
GnRH antagonists cause suppression of gonadotropins such as LH and FSH.
Without LH, the Leydig cells will not be stimulated to produce testosterone. Without
FSH, the Sertoli cells would not be stimulated to secrete androgen binding proteins,
which help keep testosterone concentrations high in the seminiferous tubules. Both
of these are necessary for spermatogenesis, so the development of sperm would
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simply not occur. - CORRECT ANSWERS GnRH antagonist is a potential male
contraceptive. How does it work?
Seminiferous tubules - CORRECT ANSWERS Where does spermatogenesis take
place?
The first phase is called the proliferation phase, which consists of all mitotic divisions
of spermatogonia. In this phase, stem cell renewal also occurs. The second phase is
the meiotic phase, which begins with primary spermatocytes and ends with haploid
spermatids. Lastly there is the differentiation phase, in which the spermatozoon
emerges with a head, flagellum and midpiece, and principal piece. - CORRECT
ANSWERS Define the three stages of spermatogenesis.
Golgi, cap, acrosomal, maturation - CORRECT ANSWERS What are the four
phases of differentiation of a sperm?
This is when the first steps of acrosome development occur. Different vesicles fuse
together to create the acrosomal vesicle, while the flagellum anchor begins to form. -
CORRECT ANSWERS Describe the golgi phase of differentiation.
The acrosome forms a distinct, easily recognized cap over the anterior portion of the
nucleus. The golgi body has done its job by packaging acrosomal contents and
membranes and begins to migrate away from the nucleus and disappears. The
flagellum begins to project from the spermatid. - CORRECT ANSWERS Describe
the cap phase of differentiation of a sperm?
The acrosome continues to spread until it covers 2/3 of the nucleus. The nucleus will
elongate, and the neck and annulus form. Then the sperm will become deeply
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embedded in Sertoli cells. - CORRECT ANSWERS Describe the acrosomal phase
of differentiation of a sperm?
Mitochondria form a spiral assembly around the flagellum that defines the midpiece.
The postnuclear cap is formed. The annulus completes the juncture between the
midpiece and principle piece. - CORRECT ANSWERS Describe the maturation
phase of differentiation of a sperm?
True - CORRECT ANSWERS Sex of the conceptus is determined by the sperm.
T/F?
midpiece - CORRECT ANSWERS The ___________ houses all mitochondria that
allows the sperm to swim to the egg.
Testes - head of epi - body of epi - tail of epi (storage) - vas deferens - CORRECT
ANSWERS What is the pathway of sperm in the male?
seminiferous tubules - CORRECT ANSWERS Androgen binding protein functions
in which structure or cell?
Change in morphology of the spermatid - CORRECT ANSWERS What process
occurs in the spermatid after the completion of meiosis?
Inhibin - CORRECT ANSWERS One factor that contributes to FSH pulses being a
lower magnitude than LH pulses is the negative feedback of which hormone that is
secreted by Sertoli cells?
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Developing sperm cells would be attacked by the immune system - CORRECT
ANSWERS If the blood-testis barrier lost its ability to function, the consequences
would be:
testosterone - CORRECT ANSWERS Which hormone is kept at high
concentrations in the seminiferous tubule?
Sertoli cell tight junctions - CORRECT ANSWERS What is the principal component
of the blood-testis barrier?
testosterone - CORRECT ANSWERS In the male, a pulse release of LH triggers a
pulse release of what hormone?:
Examine various materials with the vomeronasal organ for the presence of
pheromones - CORRECT ANSWERS Males of some species practice the Flehmen
response to:
vocalization - CORRECT ANSWERS Which sensory signal is most valuable for
signaling the opposite sex at a distance?
mounting, intromission, ejaculation - CORRECT ANSWERS What 3 acts does
copulatory behavior include?
standing to be mounted - CORRECT ANSWERS Which is one of the main
copulatory behaviors of the female?
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