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Endocrine and Exocrine Glands.docx

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BIOL 1215

Endocrine and Exocrine Glands Glandular Epithelium: Endocrine Glands Secretions of gland called hormones enter interstitial fluid and diffuse directly into the bloodstream Hormones regulate metabolic and physiological activities to maintaining homeostasis Glandular Epithelium: Exocrine Glands 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. Examples of glands include sudoriferous (sweat) glands Structural Classification of Exocrine Glands 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: 1. Whether ducts are branched or unbranched 2. Shape of the secretory portion of the gland 1.Simple Gland duct does not branch A. Simple Tubular-tubular secretory part is straight and attaches to single unbranched duct eg. gland of large intestine B. Simple Branched Tubular- tubular secretory part is branched and attaches to single unbranched duct eg. gastic glands C. Simple Coiled Tubular-tubular secretory part is coiled and attaches to single unbranched duct. eg. sweat gland D. Simple Acinar- Secreto
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