Endocrinal Function

There are two principle types of glands in the body: exocrine and endocrine.  Exocrine glands produce substances that are secreted through ducts, into a body cavity, into the lumen of an organ or on a free surface, such as the skin.  You should already be familiar with various exocrine glands, including the sudoriferous glands that produce sweat, mucous glands that produce mucus, and digestive glands that release digestive juices.