Discussion
Identify the hormone which is NOT secreted by placenta:
Answer: D
The hormone not secreted by the placenta is Androgens (in the options given).
The placenta is an endocrine organ. Its syncytiotrophoblast secretes human chorionic gonadotropin (hCG), which keeps the corpus luteum alive in early pregnancy and is detected by pregnancy tests; human placental lactogen (hPL), which adjusts maternal metabolism to favour the foetus; and progesterone and oestrogens, which maintain the pregnancy.
The placenta lacks the enzyme system to make androgens itself and instead converts androgens supplied by the foetal and maternal adrenal glands into oestrogens. So androgens are the one option it does not produce as a hormone of its own.
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