International Board of Certified Lactation Consultant (IBCLC) Practice Exam

Which cells are responsible for producing breast milk and secreting it into the alveolar lumen?

1. Myocytes

2. Adipocytes

3. Lactocytes

4. Epithelial cells

The correct answer is: Lactocytes

Lactocytes are the specific cells that produce breast milk and secrete it into the alveolar lumen, making them essential for lactation. These specialized epithelial cells line the alveoli of the mammary glands and are responsible for synthesizing the components of milk, including fats, proteins, and lactose. Following synthesis, lactocytes facilitate the secretion of these milk components into the alveolar space, where they can then be transported through the milk ducts to the nipple for breastfeeding. Understanding the role of lactocytes is crucial for evaluating lactation processes and managing breastfeeding challenges. Their proper function is vital for ensuring that an adequate supply of milk is produced, which is essential for the nourishment of the infant. This specialized role differentiates lactocytes from other cell types in the breast tissue, such as myocytes, adipocytes, and general epithelial cells, which serve other functions in the mammary gland and are not directly involved in milk production and secretion.