Examples:
2. Glandular Epithelium
Glandular epithelium (a gland) consists of single cells or clusters of cells deep to covering and lining epithelium that secrete substances into ducts, onto body surfaces or into bloodstream. Glandular epithelium is specialized for secretion. a) Endocrine Glands: These secretions (hormones) enter the interstitial fluid and then diffuse directly into the bloodstream without flowing through a duct.
Examples include:
b) Exocrine Glands : These secrete their products into ducts that empty onto the surface of a covering and lining epithelium such as skin.
Examples include:
c) Mixed Glands: Some function as both Endocrine and Exocrine such as the pancreas, ovaries, and testes.
Functional Classification of Exocrine Glands
The function of exocrine glands is based on how their secretions are released.
i) Merocrine Glands: secretions are synthesized on ribosomes attached to the rough ER, processed, sorted, and packaged by the Golgi complex and released from the cell in secretory vesicles via exocytosis.
Example:
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