Identify one hormone directly involved in the human female reproductive system that could cause the reproductive cycle and a human female to not function properly

        The hormone directly involved in this process is called Estrogen.

Explanation:

        This hormone is correlated with the development of feminine characteristics and too, the ovulation. This hormone contains estrogens as I've mentioned, and these estrogens are produced by mature ovarian follicles. The three main ones are called  estradiol, estriol and estrone. Let's think of estradiol for example, when this hormone is expelled from the body, it influences directly on the first phase of the menstrual cycle.

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