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10. This hormone initiates lactation or milk production in the mammary gland.
A. Progesterone
B. Prolactin
C. Estrogen
D. None of Above

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B. Prolactin

The hormone prolactin, secreted by the pituitary gland, is primarily responsible for stimulating actual milk production. Serum prolactin levels increase 10-20 times over baseline over the course of pregnancy. However, the action of prolactin is inhibited by high estrogen and progesterone levels during pregnancy.

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Answer:

B. Prolactin

Explanation:

Prolactin is necessary for the secretion of milk by the cells of the alveoli. The level of prolactin in the blood increases markedly during pregnancy, and stimulates the growth and development of the mammary tissue, in preparation for the production of milk.

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