BI13_Ch4 PP Slides

BI13_Ch4 PP Slides - Tissue: The Living Fabric Chapter 4...

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Tissue: The Living Fabric Chapter 4
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Goals • Be able to define a what a tissue is – Know the four basic types and their function • Know the structure and function of the various types of epithelial tissue • Know the structure and function of the various types of connective tissue • Describe 3 types of body membranes – Where are they located? – What tissues are they made of?
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What is a Tissue? • Tissues are groups of similar cells that have a common function • 4 Basic Types – Epithelial • Covers surfaces – Connective tissue • Supports and protects – Muscle • Allows movement – Nervous tissue • Controls everything
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Epithelial Tissue Characteristics Classification Types Glandular Epithelia
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Epithelial Tissue Does More Than Just Cover • Protection – Skin • Absorption – Respiratory – Digestive • Filtration – Kidneys • Secretion – Glands
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Epithelial Cells Are Polar • Have two very different surfaces – Apical • Upper surface exposed to the body exterior or internal cavity – Basal • Lower attached surface
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Apical Surface Structures • Microvilli – Finger-like extensions that increase surface area – Intestines or Kidneys • Cilia – Small “hairs” that move substances along surface – Trachea
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Basal Surface Structures • Basil lamina/ basement membrane – Thin supporting sheet of protein – Separates from connective tissue below – Filters material diffusing in from connective tissue
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Epithelial Cells Make Special Contacts • Fit tightly together – Tight junctions, and gap junctions • Form impenetrable barrier • Keeps apical membrane proteins from diffusing to basal side • Have six sides – Aids in tight packing
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Epithelial Tissue Has Nerves but Not Blood Vessels • Innervated: nerve fibers are present – Allows tissue to sense stimuli • Avascular: contain no blood vessels – Food and oxygen diffuse through basement membrane from blood vessels in connective tissue
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Epithelial Tissue Can Regenerate • Covering surfaces is dangerous • With adequate nutrition epithelial cells will grow and divide to replace lost cells
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Epithelial Tissue Characteristics Classification Types Glandular Epithelia
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Number of Layers • Simple – Layer is one cell thick • Stratified – Layer is two or more cells thick
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This note was uploaded on 08/12/2009 for the course BI 13 taught by Professor Alexasawa,ph.d during the Spring '09 term at College of the Desert.

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BI13_Ch4 PP Slides - Tissue: The Living Fabric Chapter 4...

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