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After the first 3 months of pregnancy, chief source of estrogen and progesterone

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February 15, 2012 at 1:43 pm #141703

askmaster

After the first 3 months of pregnancy, the chief source of estrogen and progesterone is the:

A. Placenta
B. Adrenal Cortex
C. Corpus luteum
D. Anterior hypophysis

Answer A
Explanation: A. When placental formation is complete, around the 12th week of pregnancy, it produces progesterone and estrogen. B. This is not the chief source of progesterone and estrogen; only small amounts are secreted. C. The corpus luteum supplies the estrogen and progesterone needed to sustain the pregnancy until the placenta is ready to take over. D. FSH is secreted by the anterior hypophysis, but it is not secreted during pregnancy.
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