Progesterone is referred to as "the hormone of pregnancy" because it:
a. stimulates lactation.
b. increases ciliary action in the fallopian tubes.
c. thins the endometrium.
d. prevents smooth muscle contraction of the uterus.
ANS: D
Progesterone is sometimes called the hormone of pregnancy because it relaxes smooth muscle in the myometrium, which prevents premature contractions and helps the uterus to expand. Proges-terone does not stimulate lactation, increase ciliary action in the fallopian tubes, or thin the en-dometrium.
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