A couple who has sought infertility counseling has been told that the man's sperm count is very low. The nurse advises the couple that spermatogenesis is impaired when which of the following occur?
a. The testes are overheated.
b. The vas deferens is ligated.
c. The prostate gland is enlarged.
d. The flagella are segmented.
ANS: a
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a. Spermatogenesis occurs in the testes. High temperatures harm the development of the sperm.
b. When the vas deferens is ligated, a man has had a vasectomy and is sterile. The sterility is not due to impaired spermatogenesis, but rather to the inability of the sperm to migrate to the woman's reproductive track.
c. The enlarged prostrate has no effect on spermatogenesis.
d. The flagella are the "tails" of the sperm. They are normally divided into the middle segment and an end segment.
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