1. Body Tissues

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Tissues
Groups of cells with similar structure and function
Four primary types:
Epithelial tissue (epithelium)
Connective tissue
Muscle tissue
Nervous tissue
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Epithelial Tissue
Locations:
Body coverings
Body linings
Glandular tissue
Functions:
Protection
Absorption
Filtration
Secretion
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Epithelial Tissue
Hallmarks of epithelial tissues:
Cover and line body surfaces
Often form sheets with one free surface, the apical surface, and an anchored surface, the basement membrane
Avascular (no blood supply)
Regenerate easily if well nourished
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Epithelial Tissue
Classification of epithelia
Number of cell layers
Simple—one layer
Stratified—more than one layer
Shape of cells
Squamous—flattened, like fish scales
Cuboidal—cube-shaped, like dice
Columnar—shaped like columns
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6. Figure 3.17a Classification and functions of epithelia.
Apical surface
Basal
surface
Simple
Apical surface
Basal
surface
Stratified
(a) Classification based on number of cell layers

7. Figure 3.17b Classification and functions of epithelia.
Squamous
Cuboidal
Columnar
(b) Classification based on cell shape