Chemical Coordination and IntegrationHard

Question

Foetal ejection reflex in human female is induced by

Options

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

Solution

Oxytocin (child birth hormone) secreted by neurohypophysis of pituitary gland stimulates contraction of uterius muscles, including labour pain for child birth, when secretion of labour pain for chid bitrh, when secretion of progesterone hormone declines, making the end of pregnancy. As the senssory impulse of increasing labour pain reaches hypothalamus, more and oxytocin is released from posterior pituitary under a positive feedback regulattion childbirth, it dilates the cervix (vaginal stretching).

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