Foetal ejection reflex in humans triggers release of

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2.Human Reproduction

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The foetal ejection reflex in humans triggers the release of

oxytocin from foetal pituitary

human chorionic gonadotropin $(hCG)$ from placenta

human placental lactogen $(hPL)$ from placenta

oxytocin from maternal pituitary.

(NEET-2013)

Solution

(d) : 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. The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contractions. This lead to expulsion of the baby out of the uterus through the birth canal.

Standard 12

Biology