In human females,the menstrual cycle can be i | vedclass

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(C) The menstrual cycle is regulated by the feedback mechanism of hormones involving the hypothalamus,pituitary gland,and ovaries.High levels of estro

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Combination of estrogen and progesterone

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(C) The menstrual cycle is regulated by the feedback mechanism of hormones involving the hypothalamus,pituitary gland,and ovaries.High levels of estrogen and progesterone exert a negative feedback effect on the anterior pituitary and hypothalamus,inhibiting the secretion of $FSH$ and $LH$.Since $FSH$ and $LH$ are required for follicular development and ovulation,their inhibition prevents the progression of the menstrual cycle.This principle is the basis for hormonal contraceptive pills,which typically contain a combination of synthetic estrogen and progesterone to prevent ovulation.

In human females,the menstrual cycle can be inhibited by the administration of:

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