1. TISSUES

2. Tissue: A Definition A group of connected, interdependent cells that cooperate to perform a specific function

3. Categories of Tissue 1. Epithelial Tissue 2. Connective Tissue 3. Muscle Tissue 4. Nervous Tissue

4. Epithelial Tissues General Features Cellular Layer + Basement Membrane

5. Epithelial Tissues General Features Cellular Layer + Basement Membrane No Direct Circulation/Blood Supply Touch Each Other Rapid Rate of Cell Reproduction

6. Epithelial Tissues Structural Classification Cell Shapes

7. Columnar Cuboidal Squamous

8. Epithelial Tissues Structural Classification Cell Shapes Cell Layers

9. Simple

10. Stratified

11. Epithelial Tissues Major Types

12. Simple Squamous Epithelium

14. Function: Exchange Sample Locations: Alveoli, capillaries

15. Stratified Squamous Epithelium

16. Function: Protection Sample Locations: Skin, Mouth, Repro tracts

17. Simple Cuboidal Epithelium Function: Absorption or Secretion Sample Locations: Kidney, Hormone Glands

18. Simple Columnar Epithelium Function: Absorption (or Secretion) Sample Location: Digestive Tract Microvilli

19. Simple Columnar Note goblet cells

20. Pseudostratified Columnar Epithelium Note cilia

21. Pseudostratified Columnar Epithelium

22. Function: Absorption, Secretion, Movement Sample Locations: Respiratory & Repro Ducts

23. Transitional Epithelium Function: Stretchability Sample Location: Urinary Bladder

24. What kind of tissue is this?

25. Epithelium cont. Epithelium that lines cavities sits on lamina propria. –Supports epithelium –Binds epithelium to other tissue –Provides nutrition Sides of cells are named –Basal –Apical (free) –Lateral

26. Basal Lamina-Lamina Propria

27. Intercellular Junctions Belts that circle cell. ZO (tight junction) acts as barrier. ZA provides for adhesion of one cell to another Spots Des is like a spot welding. Gap allows passage of chemical for communication.

28. Gap Junction

29. Specializations of Cell Surface Microvilli –Found mainly on absorptive cells –Brush border, 1  high Cilia / flagella –Cylindrical, motile structures, 5-10  high –Contain microtubules –Basal bodies

30. Microvilli Apical region of an intestinal epithelial cell seen with TEM. Filaments that constitute the core of the microvilli are clearly seen. An extracellular cell coat (glycocalyx) is bound to the plasmalemma of the microvilli. x45,000.

31. Cilia