Epithelial Tissues

-Single layer of flat cells
Functions: diffusion, filtration, or secretion in membranes

- Functions to move sex cells/has centrally located spherical nuclei
- forms lining of ducts in glands

- Forms lining of digestive tract

- Functions to move sex cells
- nuclei located at different levels within cells
- forms lining of respiratory passages/forms lining of ducts in glands

- younger cells cuboidal, older cells flattened
- forms lining of mouth

- forms inner lining of urinary bladder
- ability to stretch

-Group of cells w/ similar structure & function
- 4 primary types: (Epithelial, connective, muscle, and nervous

- located: body coverings (skin), body linings (membranes), & secretions
-functions: protection, absorption, filtration, secretion

-cells fit closely together & often form sheets
-the apical surface is the free surface of the tissue
-the lower surface of the epithelium rests on a basement membrane
-Avascular (NO BLOOD SUPPLY)
-Regenerate easily if well nourished
-Connective tissue is always under epithelium

-Number of cell layers
-simple: one layer
-stratified: more than one layer

Squamous, flattened, cuboidal (sphere), cube shaped, columnar (column-like)