Epithelial tissues

Question 1

Classification of epithelial tissues

Answer 1

shape of cells
- squamous
- cuboidal
- columnar
number of layers
- simple epithelium = single layer of cells
- stratified epithelium = 2 or more layers
apical specialisation

Question 2

how does keratin affect epithelial cells?

Answer 2

keratin enhances resistance to physical stress
- epithelial cells accumulate keratin filaments as they mature
- formation of tough, non-living surface layer

Question 3

carcinoma - define

Answer 3

malignant tumour arising from epithelial tissue
- subclasified by tissue of origin
- e.g. squamous cell carcinoma originates from stratified squamous epithelium

Question 4

what is ulceration?

Answer 4

break in continuity of epithelium