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Signals from fully developed fetus and placenta ultimately lead to parturition which requires the release of
  • a)
    estrogen from placenta
  • b)
    oxytocin from maternal pituitary
  • c)
    oxytocin from fetal pituitary
  • d)
    relaxin from placenta
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Signals from fully developed fetus and placenta ultimately lead to pa...
The process of giving birth to a baby is called parturition. It starts with a rise in estrogen/progesterone ratio, and an increase in the level of oxytocin secretion by the mother. Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully developed fetus and the placenta, which induces mild uterine contractions called fetal ejection reflex. This reflex triggers the release of oxytocin from the maternal pituitary. This hormone acts on uterine muscle and causes more contractions, which in turn secrete more oxytocin.
The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contractions which leads to expulsion of the baby.
So, the correct answer is 'Oxytocin from maternal pituitary'.
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Signals from fully developed fetus and placenta ultimately lead to parturition which requires the release ofa)estrogen from placentab)oxytocin from maternal pituitaryc)oxytocin from fetal pituitaryd)relaxin from placentaCorrect answer is option 'B'. Can you explain this answer?
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