Which of these is responsible for the "milk ejection reflex"?
A
Oxytocin
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B
Prolactin
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C
Vasopressin
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D
Luteotropin
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Solution
The correct option is A Oxytocin Sensory impulses associated with the baby’s suckling trigger the posterior pituitary gland to release oxytocin. Oxytocin stimulates contraction of the smooth muscles surrounding the alveolar ducts causing milk to be ejected from the breast. This is known as the milk-ejection reflex.