2. Skin (Integument) Figure 5.3 Epidermis

3. Layers of the Epidermis: STRATA = LAYERS Epidermis CGSBDCGSBD CGSBDCGSBD

5. Tissues Groups of cells similar in structure and function The four types of tissues –Epithelial –Connective –Muscle –Nerve

6. EPITHELIAL TISSUE

7. Epithelial Tissue –covers the body surfaces –lines the lumen of organs –lines the body cavities –forms glands and lines ducts

10. Epithelial Tissue - characteristics Cellularity – Special contacts – tight / desmosomes Polarity – apical / basal Supported by connective tissue – lamina Avascular but innervated – Regenerative –

11. Classification of Epithelia Simple or stratified Figure 4.1a

12. apical basal

13. Classification of Epithelia Squamous, cuboidal, or columnar DESCRIPTION Figure 4.1b

14. Simple Squamous Figure 4.2a DESCRIPTION FUNCTIONS PRESENCE- glomeruli, alveoli, etc.

15. Alv Org

16. Lung XS

18. Alv Org

19. AL Type II cell C Squamous

20. (bar = 1um) Lumen of alveolus Simple squamous of alveolus Simple squamous of capillary Lumen of alveolus Respiratory membrane

21. Capillary Simple squamous epithelium

22. Capillary wall is Simple squamous epithelium

23. Kidney (Glomerulus) Simple squamous epithelium (arrow) lines the glomerulus. Bar = 50um

27. NEPHRON TUBULE CONTAINS THE GLOMERULUS

29. Epithelia: Simple Cuboidal Figure 4.2b DESCRIPTION FUNCTIONS PRESENCE-

30. Beginning of nephron tubule

31. Longitudinal section of nephron tubules

32. Cross section of nephron tubules

33. 2,000L 180L 1.5L FILTER RESORB SECRETE EXCRETE

34. Epithelia: Simple Columnar Figure 4.2c DESCRIPTION FUNCTIONS PRESENCE

35. Gall Bladder Simple columnar epithelium lines the gall bladder. Note the underlying connective tissue with blood vessels. Bar = 100 Microns Gall Bladder Simple columnar epithelium lines the gall bladder. Note the underlying connective tissue with blood vessels. Bar = 100 Microns.

37. Goblet cell

38. ... with microvilli (brush border)

39. cilia

40. ... with cilia

42. Figure 4.2d DESCRIPTION FUNCTIONS PRESENCE

43. Trachea The pseudostratified columnar epithelium of the trachea is ciliated and has goblet cells. Bar = 50 um

44. Pseudostratified columnar epithelium with cilia and goblet cells

45. Trachea Pseudostratified columnar epithelium