EXOCRINE GLAND

any gland that secretes substances through a duct that in turn opens on an internal body cavity (such as the mouth or gut) or an external surface of the body (the skin or eye). It contrasts with an endocrine gland, which secretes its products (hormones) directly into the circulatory system. Saliva, sweat, and tears are products of exocrine glands. See oil gland; salivary gland; sweat gland; tear duct and gland.