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Which of the following hormones is responsible for both the milk ejection reflex and the foetal ejection reflex?

1. Relaxin
2. Oestrogen
3. Prolactin
4. Oxytocin

Correct answer: Oxytocin

Solution

Oxytocin is the hormone that stimulates uterine contractions during the foetal ejection reflex and causes milk ejection (let-down) during breastfeeding. Prolactin makes milk, but oxytocin releases it and also helps drive labor contractions.

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