Multiple choice

Which gland secretes the milk ejection hormone “oxytocin”?

  1. Pituitary gland

  2. Thyroid gland

  3. Parathyroid gland

  4. Adrenal
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A Correct answer
Explanation

 Suckling by the baby stimulates the paraventricular nuclei and supraoptic nucleus in the hypothalamus, which signals to the posterior pituitary gland to produce oxytocin. Oxytocin stimulates contraction of the myoepithelial cells surrounding the alveoli, which already hold milk. The increased pressure causes milk to flow through the duct system and be released through the nipple.

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