Epithelial tissue

4. the main function of epithelial tissue.
5. it lacks blood vessels
7. the epithelium with a single layer of cuboidal cells.
8. the epithelium with a single layer of flat cells.
10. fibres composed primarily of the protein elastin (rubber like protein) that allows them to function like rubber bands.
12. this epithelium seems stratified but it's not.
15. the ground substance and fibers between cells in a connective tissue.
17. These short fibres cluster into a mesh-like network (reticulum = network) that covers and supports the structures bordering the connective tissue.
19. a flat cell (it is wider than it is high).
20. inelastic fibres of great tensile strength made up of collagen protein.

1. an epithelium with a single layer of cells.
2. the basic structural and functional unit of all organisms
3. the basal surface of epithelial cells lies on it.
6. a group of cells of similar structure that perform a common function.
9. the surface of a cell that faces the lumen, which is the inner cavity of an organ or blood vessel, or that is exposed to the body exterior.
11. an epithelium with more layers of cells.
13. a cell that is taller than it is wide.
14. the epithelium that lines the bladder cavity. Its apical cells change their shape as the bladder fills with urine.
16. a cell that is as high as wide.
18. A passive process in which there is a net or greater movement of molecules or ions from a region of high concentration to a region of low concentration until equilibrium is reached.