Signals of parturition originate from which of the following?
A. Human Placental Lactogen
B. Parturition hormone
C. Fully developed foetus
D. Placenta
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → C and D only
A. Human Placental Lactogen — False. A pregnancy hormone, not the source of the signals.
B. Parturition hormone — False. There is no such hormone.
C. Fully developed foetus — True.
D. Placenta — True.
NCERT Extract:
Parturition and Lactation – “… The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex. This triggers release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulates further secretion of oxytocin.”