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Section 1: Male Reproductive System Anatomy
1. Which specific cell type is located between the
seminiferous tubules and is responsible for
producing testosterone in response to luteinizing
hormone (LH) stimulation?
A. Spermatogonia
B. Sertoli cell
C. Leydig cell
D. Peritubular cell
,Rationale: The Leydig cells are found in the
connective tissue interstitium between the tubules.
When LH binds its receptors, these cells convert
cholesterol into testosterone, which is vital for sperm
production and male secondary sex characteristics.
2. Which specific cell located in the walls of the
seminiferous tubules forms the blood-testis barrier
and provides nutrients to the growing germ cells?
A. Leydig cell
B. Myoid cell
C. Sertoli cell
D. Spermatid
Rationale: Sertoli cells nurse the developing
spermatids and create the blood-testis barrier,
keeping the immune system from attacking the
haploid sperm cells since they are genetically
different.
,3. What is the correct sequence of sperm
development starting from the diploid stem cell?
A. Spermatid → Secondary Spermatocyte →
Primary Spermatocyte → Spermatozoa
B. Spermatogonia → Primary Spermatocyte →
Secondary Spermatocyte → Spermatid →
Spermatozoa
C. Spermatid → Primary Spermatocyte →
Spermatogonia → Spermatozoa
D. Primary Spermatocyte → Spermatozoa →
Spermatid
Rationale: The process begins with spermatogonia
(diploid stem cells), which grow into primary
spermatocytes (which undergo meiosis I). They then
become secondary spermatocytes (which undergo
meiosis II), then mature into spermatids, and finally
transform into spermatozoa.
4. Approximately how long does it take from the time
a spermatogonium enters meiosis until a mature
spermatozoon is released?
, A. 24 hours
B. 7 to 10 days
C. About 64 to 72 days
D. 6 months
Rationale: Spermatogenesis takes roughly 64 to 72
days for a single sperm to fully develop. This is why
lifestyle changes like quitting smoking or drinking
can take a few months to show improvement in
sperm quality.
5. After sperm leave the testes, where do they go to
finish maturing and gain their ability to swim?
A. Prostate gland
B. Seminal vesicle
C. Epididymis
D. Urethra
Rationale: Sperm are essentially immobile when
they leave the testes. They travel to the epididymis,
where they gain motility and the ability to fertilize an
egg, and are stored there until ejaculation.