Which gland is primarily responsible for milk production in mammals?

The mammary gland is specifically designed for the production of milk in mammals. This structure is adapted to provide nutrition to infants, and it undergoes various physiological changes during pregnancy and lactation to facilitate milk synthesis and secretion. The cells within the mammary gland, known as alveoli, are responsible for producing milk, which is then delivered through a network of ducts.

The other glands mentioned have different functions. Eccrine glands primarily function in temperature regulation by producing sweat, while sebaceous glands secrete oils to lubricate the skin and hair. Apocrine glands are associated with hair follicles and are thought to play a role in scent production. Thus, the mammary gland stands out as the only gland dedicated to the specific role of milk production.