Which glands release their secretions via exocytosis in granular units?

The glands that release their secretions via exocytosis in granular units are classified as merocrine glands. In this type of secretion, the glandular cells produce their secretions and package them into membrane-bound vesicles. When these vesicles reach the plasma membrane, they fuse with it and release their contents into the duct of the gland or directly into the extracellular space. This process allows for a clean and efficient way to transport substances without damaging the glandular cells themselves.

Merocrine glands are commonly found in various tissues and produce a range of secretions, such as sweat, saliva, and pancreatic enzymes. The distinction of using exocytosis to release secretions underlines the precise and regulated nature of merocrine secretion compared to other types that may involve cell damage or more complex processes. The characteristic of releasing products in granular units also emphasizes the efficiency and targeting of merocrine secretion in physiological processes.