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Signals for parturition originate from:

  1. A
    Fully developed foetus only
  2. B
    Both placenta as well as fully developed foetus
  3. C
    Oxytocin released from maternal pituitary
  4. D
    Placenta only

Solution & Step-by-step Explanation

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 the foetal ejection reflex. This reflex triggers the release of oxytocin from the maternal pituitary.

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Signals for parturition originate from:
A
Fully developed foetus only
B
Both placenta as well as fully developed foetus
C
Oxytocin released from maternal pituitary
D
Placenta only

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