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Reproduction In Organisms

Question
CBSEENBI12003461
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Assertion : Parturition is induced by neural signal in maternal pituitary.

Reason : At the end of gestation period, the maternal pituitary release prolactin which causes uterine contractions.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false

  • If both assertion and reason are false

Solution

D.

If both assertion and reason are false

Parturition is the process of delivery of the foetus. It is induced by a complex neuroendocrine mechanism. The signals for parturition originates from the foetus and the placenta which induces mild uterine contractions called foetal ejection reflex. It 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 leads to expulsion of the baby out of the uterus through the birth canal.

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