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Z331 Fall 2010 Ecampus Week 1 Histology 2 Epithelial Posted

Z331 Fall 2010 Ecampus Week 1 Histology 2 Epithelial Posted...

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Week 1: Chapter 4 -   The Tissue Level of  Organization 2: Epithelial Tissue
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1. Epithelial Tissues Epithelia:  layers of cells  covering internal  or external  surfaces Protection &  permeability Glands:  structures that  produce  secretions 4-5, 115 Figure 4–6, 116
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Distribution of  epithelia in the  body Germann, 2 nd  ed., fig. 1.4 Silverthorn, 4 th  ed., fig. 3.24
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How are your cells held together & how do they  communicate with each other? Saladin, 4 th  ed., fig. 5.28
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Structure  determines  function Silverthorn, 4 th  ed., fig. 3.25 Figure 3-14, 85 Diffusion
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Characteristics of Epithelia 1. Cellularity (cell junctions) 2. Polarity (apical and basal surfaces) 3. Attachment (basal lamina) 4. Avascularity  5. Regeneration Epithelia are replaced by division  of stem cells near basal lamina Figure 4–2a, 109 4-6, 116
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Increasing Surface Area
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Unformatted text preview: Microvilli increase absorption or secretion • Cilia (ciliated epithelium) move fluids Figure 4–1, 108 3-4, 71 Classifying epithelia: • Does it have one cell layer? • Does it have more than one cell layer? • What the shape of the cells at the apical layer? Saladin, 4 th ed., fig. 5.3 Thibodeau, 6 th ed., fig. 5.3 Classifying epithelia: Figure 4–3b, 112 Stratified Squamous Epithelium • Protects against attacks • Keratin proteins add strength and water resistance Figure 4–3a, 112 Simple Squamous Epithelium Figure 4–3b, 112 Glandular Epithelia • Endocrine glands – Release hormones: • into interstitial fluid • no ducts • Exocrine glands – Produce secretions: • onto epithelial surfaces • through ducts Figure 4–6, 116...
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