ANATOMY

Detailed explanation-1: -Prolactin. 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 (19).

Detailed explanation-2: -Prolactin promotes the growth of a certain type of breast tissue called mammary alveoli, which are the components of the mammary gland where the production of milk occurs. Prolactin also stimulates the breast alveolar cells to create milk components, including: Lactose (the carbohydrate component of milk).

Detailed explanation-3: -At delivery, levels of estrogen and progesterone fall, allowing the hormone prolactin to increase and initiate milk production.