👉 In the context of medicine and biology, a secretion is a substance that is released from or produced by cells in response to an external stimulus. Examples of secreting substances include saliva, sweat, tears, mucus, urine, and feces. These substances are essential for various bodily functions, such as digestion, absorption, circulation, and elimination of waste products. They also play a role in the maintenance of homeostasis by regulating body temperature and controlling certain physiological processes within the cell itself. In