BIOL 1215 Lecture Notes - Exocrine Gland, Sebaceous Gland, Sweat Gland

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23 Apr 2013
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Secretions of gland called hormones enter interstitial fluid and diffuse directly into the bloodstream. Hormones regulate metabolic and physiological activities to maintaining homeostasis. Secrete products into ducts that empty onto the surfaces of epithelium such as skin surface or lumen of a hollow organ. Secretions include mucus, sweat, oil, earwax, saliva, and digestive enzymes. Unicellular glands- single celled (goblet cells- secretes mucus into apical surface of epithelium) Multicellular glands- many cells (sudoriferous, sebaceous-oil, salivary glands) Multicellarglands categorized according to two criteria: whether ducts are branched or unbranched, shape of the secretory portion of the gland. Tubuloacinar glands have both tubular and rounded secretory parts. Functional classification of exocrine gland s based on how secretion released. Merocrine glands- synthesized ribosomes attached to rough er; processed, stored, packaged by golgi complex; released from cell in secretory vesicles via exocytosis. Apocrine glands- accumulate secretory product at apical surface of cell; portion then pinches off from cell to release secretion.

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