During the years that a woman is more likely to be sexually active, the vagina mucosa is protect-ed from infection by:
a. the presence of autoantibodies.
b. an acidic pH.
c. low estrogen levels.
d. douching.
ANS: B
The acidic pH, not the presence of autoantibodies, protects the vaginal mucosa. This protection is not associated with low levels of estrogen or with douching.
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