Glands that secrete their products into surrounding tissue fluids are classified as exocrine glands, whereas glands that secrete onto a membrane surface are classified as endocrine glands.
Endocrine glands are glands that secrete substance directly into the bloodstream or membrane surfaces. The glands does not have duct system.
Examples include thyroid, parathyroid, adrenal and pineal glands.
Exocrine glands secrete their substances into a duct system at the epithelial.
Examples of exocrine glands are salivary glands, sweat glands, and mammary glands.
Therefore, Glands that secrete their products into surrounding tissue fluids are classified as exocrine glands, whereas glands that secrete onto a membrane surface are classified as endocrine glands.
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