GENERAL HISTOLOGY

Detailed explanation-1: -Epithelial tissue has a nerve supply, but no blood supply and must be nourished by substances diffusing from the blood vessels in the underlying tissue. The basement membrane acts as a selectively permeable membrane that determines which substances will be able to enter the epithelium.

Detailed explanation-2: -Epithelial tissue contains a high amount of cells with little to no intercellular matrix. Epithelial tissue has the potential for regeneration, which is not seen usually on other tissues such as nervous and connective tissue. Epithelial tissue contains a basement membrane on which its cells will rest on.

Detailed explanation-3: -Epithelial tissue does not contain blood vessels to prevent bleeding because this tissue is constantly exposed to mechanical and chemical wear and tear.

Detailed explanation-4: -Characteristics of epithelial tissue include cell sheets and cellularity, cell junction, polarity, basement membrane, high regeneration, nerve innervation and lack of blood vessels.

Detailed explanation-5: -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.