1. Tissue = Groups of cells and cell products with similar structure and function. There are four 1 o tissues in the body: 1) Epithelium 2) Connective 3) Muscular 4) Nervous

2. Functions of Epithelial Tissue 1.Physical Protection 2.Regulate Exchange (permeability) 3.Provides Sensation 4.Produce Secretions

3. Characteristics of Epithelial Tissue

4. 1.Cellularity – composed mostly of cells. 2.Polarity – sidenedness of tissue. 3.Attachments – physically connected to neighboring cells. 4.Avascular – has no blood supply of its own. 5.Highly Regenerative – replaces itself constantly.

5. Epithelial Tissue Tight Junctions Desmosomes Specialized apical end

6. Classification of Epithelia Cuboidal epithelium - Short cube-shaped hexagonal boxes. 1. Number of cell layers 2. Shape of Exposed (apical) cells A) Single layer of cells = Simple Epithelium B) Several layers of cells (more than one) = Stratified Epithelium Squamous epithelium - Thin and flat. Columnar epithelium - Taller than it is wide. Transitional epithelium - Changes shapes (from squamous to cuboidal).

7. Simple (1 cell layer) Stratified (more than 1 cell layer) 1) Simple Squamous Epithelium 2) Simple Cuboidal Epithelium 3) Simple Columnar Epithelium 4) Pseudostratified Ciliated Columnar Epithelium 5) Stratified Squamous Epithelium 6) Stratified Cuboidal Epithelium 7) Stratified Columnar Epithelium 8) Transitional Epithelium Classification of Epithelia Glomerular capsule; Alveolus Renal tubules; Thecal follicle (thyroid gland) Stomach, Small and Large Intestines Trachea, larynx, bronchi Keratinized = Epidermis Non-keratinized = esophagus, cheek Ducts of sweat glands Ducts of salivary glands Male urethra Urinary bladder, ureter

8. Simple Squamous Epithelium Simple Cuboidal Epithelium

9. Simple Columnar Epithelium Pseudostratified Ciliated Columnar Epithelium

10. Stratified Squamous Epithelium

11. Stratified Cuboidal Epithelium Stratified Columnar Epithelium

12. Transitional Epithelium

13. Connective Tissue Connective Tissue Proper 1)Blood 2)Lymph Supporting Connective Tissue Fluid Connective Tissue 1)Loose 1)Areolar 2)Adipose 3)Reticular 2) Dense 1)Regular 2)Irregular 3)Elastic 1)Bone 1)Spongy 2)Compact 1)Cartilage 1)Hyaline 2)Elastic 3)Fibrocartilage

14. Areolar Tissue

15. Adipose Tissue Reticular Tissue

16. Dense Regular Connective Tissue

17. Dense Irregular Connective Tissue Elastic Tissue

18. Hyaline Cartilage

19. Elastic Cartilage Fibrocartilage

20. Bone Tissue Compact Bone Spongy Bone

21. Hematopoietic stem cells produce blood and lymph cells Fluid Connective Tissue