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PowerPoint® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
PART C3
Cells and Tissues
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Epithelial Tissues
Locations
Body coverings
Body linings
Glandular tissue
Functions
Protection
Absorption
Filtration
Secretion
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Epithelium Characteristics
Cells fit closely together and often form sheets
The apical surface is the free surface of the tissue
The lower surface of the epithelium rests on a basement membrane
Avascular (no blood supply)
Regenerate easily if well nourished
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Epithelium Characteristics
Figure 3.17a
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Classification of Epithelia
Number of cell layers
Simple—one layer
Stratified—more than one layer
Figure 3.17a
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Classification of Epithelia
Shape of cells
Squamous
flattened
Cuboidal
cube-shaped
Columnar
column-like
Figure 3.17b
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Stratified Epithelia
Stratified squamous
Cells at the apical surface are flattened
Found as a protective covering where friction is common
Locations
Skin
Mouth
Esophagus
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Stratified Epithelia
Figure 3.18e
