Question

Signals for parturition originate from

• A. Fully developed foetus
• B. Placenta
• C. Oxytocin released by maternal pituitary
• D. Both A and B

Answer 1

The correct option is D Both A and B

The signals for parturition originate from fully developed foetus and placenta which induce mild uterine contractions called foetal ejection reflex. This triggers release of oxytocin (birth hormone) from the maternal pituitary gland. The oxytocin starts a series of powerful contractions in the uterus to help expel the baby and limits bleeding of the placenta near the entry of the vaginal canal.