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Lecture 3 Sep-8-2011 chapter 4 (1)

Lecture 3 Sep-8-2011 chapter 4 (1) - io2870 Chapter4 41...

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io - 2870 ntroduction to Anatomy and Physiology Chapter  4 The Tissue Level Of Organization 9/8/2011
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4-1  TISSUE TYPES Bio 2870    A & P 2 The Tissue  Level Of  Organization 9/8/2011
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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
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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
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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
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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
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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
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