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Similaire à Ch3ppt epithelial skin (19)
Ch3ppt epithelial skin
- 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
- 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