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Which one of the following hormone stimulates the 'let-down' (release) of milk from the mother’s breasts when the baby is sucking?

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

Correct answer: Oxytocin

Solution

Oxytocin is released in response to the baby’s suckling and causes contraction of myoepithelial cells around the milk glands, producing the milk let-down reflex. Prolactin mainly stimulates milk production, while progesterone and relaxin are not responsible for milk ejection.

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