The hormone which acts on the uterine muscle and causes stronger uterine contractions is known as:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Oxytocin
Option (4) Oxytocin — Correct. Of the options, only oxytocin acts on the uterine muscle in parturition; it comes from the maternal pituitary.
NCERT Extract:
Parturition and Lactation – “… Parturition is induced by a complex neuroendocrine mechanism. 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.”