Foetal ejection reflex in human female is induced by:

Options

A. pressure exerted by amniotic fluid
B. release of oxytocin from pituitary
C. fully developed foetus and placenta
D. differentiation of mammary glands

Answer

B

Explanation

Oxytocin (child birth hormone) secreted by neurohypophysis of pituitary gland stmulates contractio of uterus muscles. It stimulates labour pain for chid birth. When secretion of progesterone hormone declines it will result in making the end of pregnancy.
As the sensory impulse of increasing labour pain reaches hypothalamus, more and more oxytocin is released from posterior pituitary under a positive feedback regulation, it dilates the cervix (vaginal stretching)