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Select the correct option describing gonadotropin activity in a normal pregnant female.
High level of $FSH$ and $LH$ stimulates the thickening of endometrium.
High level of $FSH$ and $LH$ facilitates implantation of the embryo.
High level of $hCG$ stimulates the synthesis of estrogen and progesterone.
High level of $hCG$ stimulates the thickening of endometrium.
Solution
(c) : The trophoblastic cells secrete human chorionic gonadotropin hormone which has properties similar to those of lutenizing hormone $(LH)$ of the pituitary gland. It takes over the job of pituitary $LH$ during pregnancy. The $hCG$ maintains the corpus luteum and stimulates it to secrete progesterone. The latter maintains the endometrium of the uterus and causes it to grow throughout pregnancy. This also prevents menstruation. Progesterone also causes increased secretion of mucus in the cervix of the uterus that forms a protective plug during pregnancy.
