Normally menstruation occurs when A. Blood levels of estrogen and progestrone increae. B. the corpus luteum...

Normally menstruation occurs when A. Blood levels of estrogen and progestrone increae. B. the corpus luteum secretes estrogen. C. blood levels of estrogen and progesterone decrease D. blood levels of FSH fall off

Expert Solution

Answer: blood levels of estrogen and progesterone decrease

Explanation : The estrogen hormone helps in development of reproductive system and also the secondary sexual characters in the female. The progesterone hormone helps in making the uterus more fleshy so that it can accept the ovary after fertilization. The ovarian follicle after ovulation becomes corpus luteum and release progesterone hormone. The FSH helps in secretion of estrogen from the ovary.

As the estrogen and progesterone helps in development of reproductive system of the female, so that when the level of estrogen and progesterone decreases in the blood, the endometrium (top thick layer of the uterus) of the uterus of female reproductive system ruptures. This rupture of endometrium also results in bleeding due to the rupturing of blood vessels present in the endometrium. Along with the ruptured endometrium tissue and blood, the unfertilized egg is also expelled out from the body of female through the female genital organ and this flow of blood, ruptured endometrium and unfertilized egg is known as menstruation. It takes place in the first day of the menstrual cycle.

Sydney Mullin answered 1 year ago

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