What is the hormone of the alveoli of the mammary glands that secrete milks?

The hormone responsible for milk secretion in the alveoli of the mammary glands is prolactin. Prolactin is produced by the pituitary gland and stimulates the mammary glands to produce milk following childbirth. Additionally, the hormone oxytocin plays a crucial role in milk ejection during breastfeeding by causing the contraction of myoepithelial cells surrounding the alveoli.