Secretory cells are specialized cells in the body that produce and release substances such as hormones, enzymes, and mucus. These cells play a crucial role in various physiological processes, including digestion, metabolism, and immune responses. They can be found in different organs, including the pancreas, salivary glands, and gastrointestinal tract. The release of substances from secretory cells can occur through different mechanisms, such as exocytosis, where materials are expelled from the cell into the surrounding environment. This process is essential for maintaining homeostasis and facilitating communication between cells and tissues in the body.