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STD 12 - 2. human reproduction — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 2. human reproduction1 Mark
MCQ
Foetal ejection reflex in human female is induced by
  • A
    release of oxytocin from pituitary
  • ✓
    fully developed foetus and placenta
  • C
    differentiation of mammary glands
  • D
    pressure exerted by amniotic fluid.
✓

Answer

Correct option: B.
fully developed foetus and placenta
b
(b) : 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.

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