Onset of menstruation is due to

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(A) The onset of menstruation occurs due to the withdrawal or a significant fall in the level of the hormone progesterone in the blood.As the corpus l

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Fall in level of progesterone

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(A) The onset of menstruation occurs due to the withdrawal or a significant fall in the level of the hormone progesterone in the blood.As the corpus luteum degenerates,the production of progesterone decreases.This reduction in progesterone causes the uterine endometrium to break down and slough off,leading to bleeding.

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