Question

Which hormone is responsible for milk ejection during breastfeeding?

• A. Prolactin
• B. Oxytocin
• C. Estrogen
• D. Progesterone

Hint:

Remember: Prolactin = production, Oxytocin = ejection.

Answer 1

The Correct Option is B

During breastfeeding, the process of milk ejection is primarily controlled by the hormone known as oxytocin. When an infant suckles at the breast, sensory nerves send signals to the brain. This triggers the hypothalamus to stimulate the posterior pituitary gland to release oxytocin into the bloodstream.

Oxytocin causes the smooth muscles surrounding the milk-producing alveoli (mammary glands) to contract. This contraction forces milk into the ducts, where it eventually exits through the nipple, allowing the baby to feed. Thus, oxytocin is the key hormone responsible for facilitating milk ejection, often referred to as the "let-down" reflex.

The other hormone options:

• Prolactin: Primarily involved in the production and secretion of milk but not in its ejection.
• Estrogen & Progesterone: These hormones play roles in the development of the mammary glands but are not directly responsible for milk ejection during breastfeeding.

Therefore, the correct answer is Oxytocin.