NEET PG DENTAL EXAM

Detailed explanation-1: -Epithelial tissues do not contain blood vessels and as such are avascular. Connective tissues are usually highly vascular and so the nearby connective tissue provides essential nutrients (from the blood) to the epithelial tissue.

Detailed explanation-2: -Epithelial tissue does not contain blood vessels to prevent bleeding because this tissue is constantly exposed to mechanical and chemical wear and tear. Although this tissue is avascular, it is well supplied with nutrients through diffusion mechanism.

Detailed explanation-3: -Examples of avascular tissue include epithelial cells, cornea of the eye and cartilage. The epithelial cells form a protective layer on the skin, the cornea allows the light to enter the eye and the cartilage is a connective tissue. Exchange of nutrients in avascular tissues takes place through diffusion.

Detailed explanation-4: -Epithelia do not have their own blood supply (avascular), they rely on diffusion for exchange of oxygen and metabolites. Epithelia contain specialised cell-cell junctions that bind adjacent cells to each other.