PNB 2265 FINAL EXAM QUESTIONS AND CORRECT ANSWERS (2024/2025 UPDATE) GRADED A+ 100% VERIFIED
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Course
PNB 2265
Institution
PNB 2265
PNB 2265 FINAL EXAM QUESTIONS AND CORRECT ANSWERS (2024/2025 UPDATE) GRADED A+ 100% VERIFIED
Where does spermatogenesis occur? - Answer- seminiferous tubules
Stems cells in spermatogenesis - Answer- spermatogonia which are diploid cells having 46 chromosomes
in response to LH - Answer- th...
PNB 2265 FINAL EXAM QUESTIONS
AND CORRECT ANSWERS
(2024/2025 UPDATE) GRADED A+
100% VERIFIED
Where does spermatogenesis occur? - Answer- seminiferous tubules
Stems cells in spermatogenesis - Answer- spermatogonia which are diploid cells having
46 chromosomes
in response to LH - Answer- the Leydig cells produce steroid hormones
in response to FSH and Testosterone - Answer- sertoli cells support spermatogenesis
The two daughter cells in spermatogonia - Answer- one becomes a primary sperm and
the other stays a spermatogia to make more primary spermatocytes which is unique to
males (females cannot do this)
process of spermatogenesis - Answer- spermatogia turn into primary spermatocytes
then my meiosis I reduce to secondary spermatocytes then by meiosis II become
spermatids
spermiogenesis - Answer- making a spermatid to a spermatozoa (the sperm itself) by
removing excess cytoplasmic baggage to forma head, acrosome, midpiece and tail
how many chromosomes does the head of the sperm have? - Answer- 23
acrosome - Answer- in the head of the sperm- a cap of enzymes needed to fertilize
(digestive)
hydrolytic enzymes and hyaluronidase
Midpiece - Answer- contains mitochondria to make ATP so that flagellum can swim
, 3. respond to stimulation by testosterone and FSH to stimulate secretion of paracrine
agents that then stimulate sperm proliferation and differentiation
4. secrete inhibin
5.phagocytosis of defective sperm
6. secrete MIH/MIS -- make sure male system only gets male system and not female as
well
inhibin in the sperm - Answer- is secreted from sertoli cells and inhibits the secretion of
FSH only from anterior pituitary
transport of sperm from seminiferous tubule lumen - Answer- rete testis
efferent ductules
epididymis
vas deferens
ejaculatory duct
urethra
erections - Answer- parasympathetic reflex
vascular
S2-S4
Nitric oxide is the transmitter
uses cAMP mechanism
erection process - Answer- dilation of arteries serving corpora cavernosa and
spongiosum that become engorged with blood under high pressure while veins are
compressed and blood is trapped
viagra - Answer- phosphodiesterase inhibitor to prevent the inactivation of cGMP which
is the second messenger from NP so erection will continue
ejaculation - Answer- sympathetic spinal reflex (L1-L2)
smooth muscle contraction of reproductive ducts and accessory glands that empty
sperm and glandular secretions into urethra; bladder sphincter constricts and
contractions of urethral smooth muscle eject semen
GnRH - Answer- goes through the portal system to anterior pituitary to signal the
release of gonadotropins
FSH - Answer- follicle stimulating hormone
stimulates spermatogenesis in the testes indirectly by stimulating sertoli cells to release
androgen binding protein
also causes the release of local signals to stimulate spermatogenesis
ABP - Answer- androgen binding protein
released from sertoli cells
causes spermatogenic cells to bind and concentrate testosterone
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