Write short notes on : Parturition

Explanation

Parturition is the act of expelling the full term young one from the mother.s uterus at the end of gestation period. It is induced by both nervous system and hormones secreted by the endocrine glands of the mother. The signals for childbirth (parturition) originates from the fully matured foecus and placenta which induce mild uterine contractions called foeral-ejection reflex. This causes quick release of oxytocin from maternal posterior lobe of pituitary. The amount of oxytocin is increased just before and during labour pains which promote contractions of the uterine muscles. Relaxin increases the flexibility of the pubis symphysis and helps to dilate the uterine cervix.