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The signals for parturition originate from
A
Fully developed foetus only
B
Placenta only
C
Placenta as well as fully developed foetus
D
Oxytocin released from maternal pituitary
Detailed Solution
Parturition is induced by a complex neuroendocrine mechanism.
The signals for parturition originate from the fully developed foetus and the placenta; they induce mild uterine contractions called the foetal ejection reflex.
This reflex triggers the release of oxytocin from the maternal pituitary.
Oxytocin acts on the uterine muscle and causes stronger contractions, which in turn stimulate further secretion of oxytocin, until the baby is expelled.
So oxytocin release is a result of the signals, not their origin.
Hence the signals originate from the placenta as well as the fully developed foetus.
The signals for parturition originate from the fully developed foetus and the placenta; they induce mild uterine contractions called the foetal ejection reflex.
This reflex triggers the release of oxytocin from the maternal pituitary.
Oxytocin acts on the uterine muscle and causes stronger contractions, which in turn stimulate further secretion of oxytocin, until the baby is expelled.
So oxytocin release is a result of the signals, not their origin.
Hence the signals originate from the placenta as well as the fully developed foetus.