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Signals from fully developed foetus and placenta ultimately lead to parturition which requires the release of
A
Estrogen from placenta
B
Oxytocin from maternal pituitary
C
Oxytocin from foetal pituitary
D
Relaxin from placenta
Detailed Solution
The signals for parturition originate from the fully developed foetus and the placenta and induce mild uterine contractions, called the foetal ejection reflex.
This triggers the release of oxytocin from the maternal pituitary.
Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulate further secretion of oxytocin.
This stimulatory reflex continues, giving stronger and stronger contractions, until the baby is expelled through the birth canal.
Hence parturition requires the release of oxytocin from the maternal pituitary.
This triggers the release of oxytocin from the maternal pituitary.
Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulate further secretion of oxytocin.
This stimulatory reflex continues, giving stronger and stronger contractions, until the baby is expelled through the birth canal.
Hence parturition requires the release of oxytocin from the maternal pituitary.