Question

Assertion : Parturition is induced by neural signal in maternal pituitary.

Reason : At the end of gestation period, the maternal pituitary release prolactin which causes uterine contractions.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (d) A and R are false

Explanation :

The process of delivery of the foetus is called parturition. Parturition is induced from the fully developed foetus and the placenta. Parturition involves foetal election reflex which are mild contractions of the placenta. This reflex triggers release of oxytocin from the maternal pituitary which acts on the uterine muscles and causes stronger uterine contractions and that further stimulates secretion of oxytocin. This stimulatory reflex between uterine muscle contraction and oxytocin secretion continues resulting in stronger contractions and eventually leading into expulsion of the baby out of the uterus.