1. Epithelial Tissue

2. GENERAL LOCATION
Body coverings
Body linings
Glandular tissue

3. GENERAL FUNCTIONS
Protection
Absorption
Filtration
Secretion

4. GENERAL CHARACTERISTICS
Cells fit closely together
Tissue layer always has one free surface
The lower surface is bound by a basement membrane
Avascular (no blood supply)
Regenerates easily if well nourished

5. CLASSIFICATION Number of Cell Layers -Simple: one cell layer
-Stratified: more than one cell layer
Cell Shape
-Squamous: flattened
-Cuboidal: cube-shaped
-Columnar: column like

7. TYPES OF EPITHELIAL TISSUE
Simple Squamous
Structure: single layer of flat cells
Function: forms membranes; lines
body cavities
Found in: capillaries, lining of lungs

8. SIMPLE SQUAMOUS

9. Endothelium
Specialized type of squamous cell that permits efficient diffusion of materials. Very fragile but this allows for rapid gas exchange. Found lining the heart, lungs, blood & lymph vessels.

10. TYPES OF EPITHELIAL TISSUE
Simple Cuboidal
Structure: single layer of cube-like cells
often arranged around a space
(follicle)
Function: secrete fluids; absorption
Found in: kidney tubules; ovaries

11. SIMPLE CUBOIDAL

12. TYPES OF EPITHELIAL TISSUE
Simple Columnar
Structure: single layer of tall cells
Function: secrete mucus & enzymes;
absorption
Found in: the digestive tract lining

13. SIMPLE COLUMNAR

14. Goblet cells
Spherical cells that produce mucus - a lubricating material for the digestive tract

15. TYPES OF EPITHELIAL TISSUE
Psuedostratified (Ciliated)
Structure: hair-like projections
Function: absorption, secretion of mucus,
and aids in the movement of
particles
Found in: upper respiratory tract & reproductive
organs

16. PSUEDOSTRATIFIED (CILIATED)

17. TYPES OF EPITHELIAL TISSUE
Stratified
Structure: many cell layers
Function: protection in areas where friction
is common
Found in: skin, mouth, esophagus

18. STRATIFIED

19. TYPES OF EPITHELIAL TISSUE
Transitional
Structure: changes shape based on
amount of stretch
Function: allows for expansion
Found in: urinary tract/bladder lining

20. TRANSITIONAL

21. SOURCES OF SLIDES

22. Gland
One or more cells that secrete a particular product

23. TYPES OF GLANDS Endocrine - ductless; secretions are
hormones that enter the blood
vessels
ex: thyroid, adrenal, pituitary

24. TYPES OF GLANDS Exocrine - empty through ducts to the
epithelial surface
ex: sweat, oil, mammary, salivary

25. End.