Q. 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
Explanation
[Solution from source] Signals from the mature foetus and placenta set up the foetal ejection reflex, which triggers release of oxytocin from the mother's posterior pituitary; oxytocin causes strong uterine contractions that expel the baby. The oxytocin acts on the mother's uterus, so it is the maternal, not foetal, pituitary that releases it. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.