Chemical Coordination and IntegrationHard

Question

With drawl of which of the following hormones is the immediate cause of menstruation ?

Options

A.Estrogen
B.FSH
C.FSH-RH
D.Progesterone

Solution

Menstruation is causad by the reduction of estrogen and progesterone, especially progesterone at the end of monthly ovarian cycle. The first effect is decreased stimulation of the endometrial cells by these two hormones followed rapidly by involution of the endometrium itself to about 65% of its previous thickness.

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