1. Chapter 4
Body Tissues and Membranes

2. * tissue = specialized cells of one type that
performs a common function
* study of tissues = histology
* four major tissue types :
epithelial – coverings and linings
connective - support
muscular - movement
nervous - control

3. 4.1 Epithelial Tissue
* protection, secretion, absorption * easily regenerates (makes new cells) * cells are tightly packed together (sheets) * always has a free surface * other surface is attached to the basement membrane

6. * classified according to # of cell layers : simple = one layer stratified = more than one layer

7. Classification of Epithelia
Simple or stratified

8. * classified according to shape of cells: squamous = flattened cells cuboidal = cube-shaped cells columnar = elongated (tall) cells

11. A. Squamous Epithelium

13. 1. simple squamous epithelium
* F – allows passage of materials
* L – kidneys, lungs, blood vessels, heart

16. Simple Squamous Epithelium
Top View

19. #11

20. 2. stratified squamous epithelium
* F - protection
* L – skin, oral cavity, pharynx,
urinary and reproductive tracts

22. Epithelia: Stratified Squamous

25. #13

27. B. Cuboidal Epithelium

28. 1. simple cuboidal epithelium
* F – secretion, absorption
* L – kidney tubules, ducts of glands, ovaries

37. C. Columnar Epithelium 37

38. 1. simple columnar epithelium
* F – secretion (mucus), absorption
* L – digestive tract, ducts of glands

41. Simple Columnar Epithelium

45. D. Pseudostratified Columnar Epithelium
* single layer (simple), cells differing heights

46. may have cilia = pseudostratified ciliated columnar epithelium
* may have cilia = pseudostratified ciliated columnar epithelium * F – protection, secretion * L – respiratory and reproductive tracts

53. E. Transitional Epithelium
* stratified (looks like cuboidal/squamous)

54. * F – stretches
* L – urinary bladder, ureters

56. Epithelia: Transitional

60. Transitional Epithelium (Ureter)
3 apical (free) surface