Human placental lactogen (hPL), relaxin, progesterone and estrogen are all secreted by

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placenta

corpus luteum

ovary

interstitial cells

answer is A.

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Detailed Solution

Placenta acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, progestogens, relaxin etc.

Human placental lactogen is a hormone that is released by the placenta during pregnancy. It is not secreted by the ovary.

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