1. Cell Tissues
Epithelial Tissues

2. Tissues Group of cells with similar structure and function
Main functions
Covering (epithelial)
Support (connective)
Movement (muscle)
Control (nervous)

3. Epithelial Tissue Lining, covering, and glandular tissues Functions
Protection
Absorption
Filtration
Secretion (glandular only)

4. Epithelial Tissue Characteristics
Fit together in sheets (except glandular)
Apical surface – free surface
Basement membrane – structureless, rests on
Avascular – no blood supply
Regenerate easily

5. Epithelial Tissue Classification – 2 part naming system
Cell arrangement/number of layers
Simple – one layer
Stratified – more than one layer
Cell shape
Squamous – flat
Cuboidal – cube shaped
Columnar – column shaped

6. Simple Epithelial Tissue
Simple squamous
Single layer, flat cells
Form membranes where exchanges occur
Found in lungs, capillaries, serous membranes
Line ventral cavity and ducts

7. Simple Epithelial Cells
Simple cuboidal
Single layer, cube shaped
Forms glands and ducts
Simple columnar
Single layer, tall cells
Line digestive tract
Often contain goblet cells (produce mucous)

8. Stratified Epithelial Cells
Stratified squamous
Most common epithelial cell
Apical surface – squamous
Basal layer – cuboidal/columnar
Found in areas of frequent abuse
Esophagus, mouth, outer skin

9. Stratified Epithelial Tissue
Stratified Cuboidal
Usually 2 layers, Surface is cuboidal
Stratified Columnar - Basal cells vary
Transitional Epithelial tissue
Line organs in the urinary system (stretching)
Cuboidal/columnar basal cells, Apical surface cells vary

10. Glandular Epithelial Tissue
Secrete
Two types
Endocrine
Ductless
Diffuse products
Exocrine
Ducts
Dump secretions on surface