Human Physiology

In humans, the mammary glands are specialized structures responsible for the production and secretion of milk. Each mammary gland is composed of lobes, which are essential for its function. The correct answer to how many lobes the mammary glands are divided into is 15–20 lobes.

The lobes within the mammary glands are further divided into smaller structures called lobules, which contain clusters of alveoli. These alveoli are the sites for milk production, and they connect to milk ducts that transport milk to the nipple. This anatomical organization facilitates the efficient production and delivery of milk.

Thus, the correct number of lobes in human mammary glands is expressed as the range 15 to 20 lobes, highlighting the slight variation that can occur naturally across individuals.