1. Histology- Study of Tissues

2. Physiological systems are made up of organs that serve specific functions. Organs are made up of tissues, which are then made up of cells.

3. Four types of tissue: ► Epithelial ► Connective ► Muscle ► Nervous

4. Epithelial tissues are sheets of tightly connected epithelial cells. The tissues form skin and line hollow organs.

5. Some epithelial cells can: ► Secrete substances, like hormones ► Move substances with cilia ► Act as chemical receptors ► Create boundaries ► Control filtration and transport Function of Epithelial cells

6. Cells in Epithelial Tissue ► Squamous Cells- Simple /Stratified ► Columnar Cells- Simple/pseudostratified ► Cuboidal Cells- Simple/stratified ► Transitional Cells

7. Classification of Epithelial Tissue

9. Epithelial Tissue (A)

10. Stratified squamous epithelium, nonkeratinized, from human mouth. LM, H&E stain.

11. Simple Cuboidal Epithelium

12. Simple Columar Epithelium

13. Simple columnar epithelium from human intrahepatic bile duct. LM, trichrome stain.

14. Simple cuboidal epithelium lining follicles of human thyroid gland. LM, H&E stain.

15. Pseudostratified columnar epithelium lining a human bronchus; cilia on many cells. LM.