Lecture 3 Sep-8-2011 chapter 4 updated

Lecture 3 Sep-8-2011 chapter 4 updated - io - 2870...

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Unformatted text preview: io - 2870 ntroduction to Anatomy and Physiology Chapter 4 The Tissue Level Of Organization 9/8/2011 4-1 TISSUE TYPES Bio 2870 A & P 2 The Tissue Level Of Organization 9/8/2011 4-2 EPITHELIAL TISSUE I. General Information A. Includes Epithelia (Layers Of Cells That Cover Internal Or External Surfaces) & Glands (Produce Fluid Secretions) II. Characteristics A. Cellularity B. Polarity C. Attachment D. Avascularity E. Regeneration Bio 2870 A & P 3 The Tissue Level Of Organization 9/8/2011 III. Functions A. Protection B. Control Permeability C. Sensation D. Produce Secretions i. Glandular Epithelial Tissue 4-2 EPITHELIAL TISSUE Bio 2870 A & P 4 The Tissue Level Of Organization 9/8/2011 4-2 EPITHELIAL TISSUE IV. Specializations Of Epithelial Cells A. Apical Surface i. Microvilli ii. Cilia Bio 2870 A & P 5 The Tissue Level Of Organization 9/8/2011 Microvilli Membrane extensions containing microfilaments Increase Surface Area Of Cell For Absorption CILIA Beat move rhythmically to move substances along the cell surface 4-2 EPITHELIAL TISSUE IV. Specializations Of Epithelial Cells B. Lateral Surface 1. Occluding/Tight Junction 2. Gap Junction 3. Desmosome/ Macula Adherens a. Spot Desmosome b. Hemidesmosome Bio 2870 A & P 6 The Tissue Level Of Organization 9/8/2011 4-2 EPITHELIAL TISSUE IV. Specializations Of Epithelial Cells Bio 2870 A & P 7 The Tissue Level Of Organization Cell Junctions Occluding (Tight) junctions between two plasma membranes Adhesion belt attaches to terminal web Prevents passage of water and solutes Isolates wastes in the lumen Gap junctions allow rapid communication Held together by channel proteins (junctional proteins, connexons) Allow ions to pass Coordinate contractions in heart muscle 9/8/2011 4-2 EPITHELIAL TISSUE IV. Specializations Of Epithelial Cells Bio 2870 A & P 8 The Tissue Level Of Organization Cell Junctions Macula adherens (Desmosomes) 1. CAMs, dense areas, and intercellular cement 2. Spot desmosomes tie cells together allow bending and twisting 1. Hemidesmosomes attach cells to the basal lamina 9/8/2011 4-3 CLASSIFICATION OF EPITHELIA I. CATEGORIES A. Shape B. Number Of Cell Layers Bio 2870 A & P 9 The Tissue Level Of Organization 9/8/2011 4-3...
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Lecture 3 Sep-8-2011 chapter 4 updated - io - 2870...

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