324Lecture5 exocrine glands

324Lecture5 exocrine glands - Glandular Epithelium...

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Glandular Epithelium
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Glandular Epithelium Glandular Epithelium: epithelium of cells specialized to produce secretion. All glands are of composed of epithelium. Secretion – Exocytotic release of products, not metabolic wastes Molecules to be secreted may be stored in membrane bound secretory granules (vesicles)
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Gland Categories A) Presence or absence of ducts Exocrine – ducted Endocrine - ductless B) Uni- or multicellular C) Mode of secretion D) Secretion products
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Gland Categories 1) Exocrine - glands that exude secretions into a ductule system. Have two parts, acinous = secretory bulb and ductule. 2) Endocrine - glands exuding secretions directly into body fluids, ultimately blood. 3) Mixed - glands combining both the above characteristics (e.g. liver) in the same cell 4) Paracrine - tissue secretions affecting own cells
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Cellular Composition 1) Unicellular - single cell gland, Goblet cell; mucous secreting. GI tract, respiratory ducts. Secretion process alters cell and nucleus shape.
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324Lecture5 exocrine glands - Glandular Epithelium...

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