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These glands form part of the endocrine system and information on them is included in this website There is another type of gland called an exocrine gland (eg sweat glands, lymph nodes) These are not considered part of the endocrine system as they do not produce hormones and they release their product through a ductThe glands are structures formed by epithelial cells of secretory function , in the glands are synthesized substances that are released into the bloodstream ( endocrine glands ) or inside cavities of the body or its surfaces ( exocrine glands ) All the glands of the body are formed by an invagination growth of an epithelial surface Exocrine glands are glands that are responsible for substances that pass through a network of ducts and are eventually released into an internal or external surface These surfaces include the mammary glands, sebaceous glands, and mucusproducing glands Examples of these glands include sweat glands, salivary glands, and digestive glands 1 Exocrine