Secretions are substances produced and released by cells or glands in the body. These substances can include fluids, enzymes, hormones, and other compounds that play essential roles in various physiological processes. For example, saliva is a secretion that helps with digestion and keeps the mouth moist. Different types of secretions serve specific functions. Sweat is a secretion that helps regulate body temperature, while mucus protects and lubricates surfaces in the respiratory and digestive tracts. Hormonal secretions, such as insulin, are crucial for regulating metabolism and maintaining homeostasis in the body.