Question

Given below are the steps involved in parturition. Arrange them in proper sequence and select the correct option.
I. The induction of mild uterine contractions is called foetal ejection reflex.
II. Stronger uterine contractions causing the further release of oxytocin.
III. Origination of signals from the fully developed foetus and placenta.
IV. Release of oxytocin from maternal pituitary
V. Expulsion of baby from the birth canal

• A. III, IV, I, II, V
• B. III, I, IV, II, V
• C. I, III, II, IV, V
• D. II, IV, III, I, V

Answer 1

Answer: (B)

The steps involved in parturition are as follows:
$1.$ The fully developed foetus and the placenta give rise to signals for parturition.
$2.$ This induces mild uterine contractions known as foetal ejection reflex.
$3.$ This stimulates the release of oxytocin from the maternal pituitary.
$4.$ The uterine contractions keep getting stronger which causes further release of oxytocin.
$5.$ The simultaneous uterine contractions and release of oxytocin finally causes the expulsion of the baby from the birth canal.