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2.Human Reproduction
normal
Withdrawal of which of the following hormones is the immediate cause of menstruation?
A
Progesterone
B
Estrogen
C
$FSH$
D
$FSH-RH$
(AIPMT-2006)
Solution
(a) :The menstrual cycle consists of three phases; proliferative phase, secretory phase and menstrual phase. During menstrual phase the production of $LH$ is considerably reduced. The withdrawal of this hormone causes degeneration of the corpus luteum and, therefore, progesterone production is reduced. The endometrium degenerates and breaks down. Thus menstruation begins.
Standard 12
Biology
