Parturition is induced by complex neuroendocrine mechanism and signals of parturition originate from:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Fully developed foetus and placenta
Parturition is the process of giving birth. The signals for it come from the fully developed foetus and the placenta. They cause mild contractions of the uterus, called the foetal ejection reflex.
(1) Pituitary gland — Incorrect. The mother’s pituitary does not start the signal. It releases oxytocin in response to it.
(2) Fully developed foetus and placenta — Correct. The signal starts here.
(3) Ovary — Incorrect. The ovary takes no part in starting labour.
(4) Uterus — Incorrect. The uterus contracts as a result of the signals. It is not where they come from.
NCERT Extract:
Parturition and Lactation –
