Answer:
B) blood levels of estrogen and progesterone decrease
Explanation:
Menstruation is a normal phenomenon in a fertile female. It is the biological process whereby the flow of blood from the uterine lining occurs. Menstruation usually occurs after implantation, which is the attachment of a fertilized egg in the uterus, fails to occur.
On a monthly basis, the female reproductive organ prepares the uterus for implantation, which is physiological stimulated by an increase in the blood levels of estrogen and progesterone. However, when there is no implantation, the level of these two reproductive hormones (estrogen and progesterone) fall, and menstruation is stimulated to occur.
Menstruation occurs when the blood levels of oestrogen and progesterone decrease.
Menstruation can be described as the release of blood from the reproductive tract of a female. This cycle is mainly driven by the female hormones such as oestrogen and progesterone. During this period, the level of the oestrogen and progesterone drastically reduces.
Blood flow lasts between 1-5 days but it differs in different females, it last for 3 days in some and 5 days in some other ladies and is most times accompanied with cramps.
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