Question

In a normal human female, why does menstruation only occur if the released ovum is not fertilised? Explain.

Hint:

The degeneration of the corpus luteum after unfertilized cycles leads to menstruation, resetting the reproductive system.

Answer 1

- Upon lack of ovum fertilisation, the corpus luteum degrades, precipitating a decline in progesterone. - This progesterone reduction instigates the disintegration of the engorged uterine endometrium, culminating in its expulsion as menstrual flow.