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 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,
,REPRODUCTIVE PHYSIOLOGY FINAL EXAM QUESTIONS AND
ANSWERS LATEST UPDATE 2024/2025 ALL ANSWERS 100% CORRECT
DETAILED BEST SOLUTION GRADED A+ FOR EXCELLENT PASS
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 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.
,REPRODUCTIVE PHYSIOLOGY FINAL EXAM QUESTIONS AND
ANSWERS LATEST UPDATE 2024/2025 ALL ANSWERS 100% CORRECT
DETAILED BEST SOLUTION GRADED A+ FOR EXCELLENT PASS
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?
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:
, REPRODUCTIVE PHYSIOLOGY FINAL EXAM QUESTIONS AND
ANSWERS LATEST UPDATE 2024/2025 ALL ANSWERS 100% CORRECT
DETAILED BEST SOLUTION GRADED A+ FOR EXCELLENT PASS
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?
decrease - CORRECT ANSWERS Would you like to increase or decrease the
length of the refractory period?
boar - CORRECT ANSWERS Which of the following species has the longest
copulation time?
a. Boar
b. Stallion
c. Bull
d. Ram
prey species - CORRECT ANSWERS What factors may have influenced the
evolution of a short copulation time?
increase - CORRECT ANSWERS Would you expect a female in estrus to
increase or decrease her amount of physical activity?
posture, vocalization, pheromones - CORRECT ANSWERS What are 3 ways
estrous females attract males?
cow - CORRECT ANSWERS Name a species that shows homosexual
mounting.
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 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,
,REPRODUCTIVE PHYSIOLOGY FINAL EXAM QUESTIONS AND
ANSWERS LATEST UPDATE 2024/2025 ALL ANSWERS 100% CORRECT
DETAILED BEST SOLUTION GRADED A+ FOR EXCELLENT PASS
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 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.
,REPRODUCTIVE PHYSIOLOGY FINAL EXAM QUESTIONS AND
ANSWERS LATEST UPDATE 2024/2025 ALL ANSWERS 100% CORRECT
DETAILED BEST SOLUTION GRADED A+ FOR EXCELLENT PASS
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?
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:
, REPRODUCTIVE PHYSIOLOGY FINAL EXAM QUESTIONS AND
ANSWERS LATEST UPDATE 2024/2025 ALL ANSWERS 100% CORRECT
DETAILED BEST SOLUTION GRADED A+ FOR EXCELLENT PASS
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?
decrease - CORRECT ANSWERS Would you like to increase or decrease the
length of the refractory period?
boar - CORRECT ANSWERS Which of the following species has the longest
copulation time?
a. Boar
b. Stallion
c. Bull
d. Ram
prey species - CORRECT ANSWERS What factors may have influenced the
evolution of a short copulation time?
increase - CORRECT ANSWERS Would you expect a female in estrus to
increase or decrease her amount of physical activity?
posture, vocalization, pheromones - CORRECT ANSWERS What are 3 ways
estrous females attract males?
cow - CORRECT ANSWERS Name a species that shows homosexual
mounting.
