The exocrine system consists of glands that secrete substances to lubricate and protect the body. These glands include the sweat, salivary, mucous, mammary, gastric, prostate, bile, ceruminous, sebaceous, and lacrimal glands. Substances produced by exocrine glands flow through ducts to epithelial surfaces. The three shapes of epithelial cells are squamous, columnar and cuboidal. These cell types make up hair, skin and other tissue types on or near the body's surface.
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