Ch 4 part 2
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- main function is secretions - glandular cells that lie in clusters deep to the covering and lining epithelium
- gland - cell(s) that secrete substances into ducts (tubes), onto a surface, or into the blood - all glands are endocrine or exocrine
- secrete hormones that enter the interstitial fluid and then diffuse directly into the bloodstream without flowing through a duct.
- the hormones regulate metabolic and psysiological activities to maintain homeostasis
- endocrine glands - pituitary, thyroid, and adrenal
- secrete into ducts that empty onto the suface of covering and lining epithelium (skin surface or the lumen of hollow organs)
- secretions include mucus, sweat, oil, earwax, saliva, digestive enzymes
classification of exocrine glands
- 1. unicellular glands - single-celled - ex. goblet cells that secrete mucus onto apical surface of lining epithelium
- 2. multicellular glands - many cells - salivary and sebaceous
- a.simple gland - duct does not branch
- b. compound gland - duct branches
- c. tubular gland - glands with tubular secretory parts
- d. acinar glands - glands with rounded secretory parts
- e. tubuloacinar - have both rounded and tubular secretory parts
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