alleryWhich posterior pituitary hormone stimulates the uterine contractions that expel the baby during parturition?
AProlactin
BProgesterone
COxytocin
DEstrogen
Answer & Solution
Correct answer: C. Oxytocin
1. Parturition is the expulsion of the young one from the uterus at the end of gestation.
2. Oxytocin from the posterior pituitary stimulates uterine contractions.
3. These contractions provide the force to expel the baby, causing birth.
4. Prolactin starts milk production, while progesterone and estrogen are ovarian hormones, so they are ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 17 Reproduction in Plants and Animals "Parturition (Child Birth)", p.260_
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