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Question
What is the primary role of oxytocin in the mammary glands during lactation?
Options
To promote duct growth and branching
To suppress premature milk ejection during pregnancy
To trigger milk ejection by contracting myoepithelial cells
To stimulate milk synthesis in alveolar cells
MCQ
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Solution
Oxytocin, released by the posterior pituitary, triggers the let-down (milk ejection) reflex by causing myoepithelial cells surrounding the alveoli to contract. This contraction squeezes milk through the mammary tubules, ducts, and out through the nipple when the infant suckles.
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