Secreção

Secreção is a biological process where cells or glands produce and discharge substances. These substances, known as secretions, serve various functions within an organism or for external use. Secretion involves the synthesis of molecules, their storage, and their release from the cell. This release can occur through different mechanisms, including exocytosis, where vesicles containing the secretion fuse with the cell membrane and release their contents outside the cell.

Secretion plays a vital role in many physiological processes. For example, digestive glands secrete enzymes that break down food, while endocrine glands secrete hormones that regulate bodily functions. Sweat glands secrete perspiration to help cool the body, and mucous membranes secrete mucus to lubricate and protect surfaces. In plants, secretory cells can produce nectar to attract pollinators or resins to protect against pests. The composition and function of secretions are highly diverse, reflecting the specific needs of the organism. The study of secretions is part of physiology and endocrinology, contributing to our understanding of health and disease.