What is the primary role of prolactin in the human body?

• A. Regulates lactation
• B. Regulates metabolism
• C. Regulates calcium levels
• D. Regulates blood pressure

Answer: (A)

Prolactin primarily plays a crucial role in regulating lactation, which is the production of milk in the mammary glands following childbirth. This hormone is secreted by the anterior pituitary gland, and its levels rise significantly during pregnancy, preparing the breasts for milk production. After delivery, the stimulation of the nipples by suckling triggers further release of prolactin to promote continued milk production and secretion, ensuring adequate nourishment for the infant.

While prolactin has multiple functions, including potential roles in metabolism and immune regulation, its most significant and well-established role is in lactation. The other functions you mentioned are more directly associated with hormones such as insulin or parathyroid hormone, which handle metabolism and calcium levels respectively, while blood pressure regulation is primarily managed by hormones such as aldosterone and angiotensin. Hence, prolactin's primary role remains squarely focused on facilitating breastfeeding.