Used with permission from Pearson for Clay Virtual Academy. Copyright Pearson, Inc.

1. PowerPoint® Lecture Slide Presentation
by Patty Bostwick-Taylor,
Florence-Darlington Technical College
Cells and
Tissues
3
PART C
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

2. Epithelial Tissues
 Locations
 Body coverings
 Body linings
 Glandular tissue
 Functions
 Protection
 Absorption
 Filtration
 Secretion
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

3. 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

4. Epithelium Characteristics
Figure 3.17a
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings

5. 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

6. 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

7. 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

8. Stratified Epithelia
Figure 3.18e
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings