MICROANATOMY

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: -The correct answer is A) Epithelial tissue. Epithelial tissues are avascular tissues because they lack blood vessels (arteries and veins) and blood capillaries.

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. Although this tissue is avascular, it is well supplied with nutrients through diffusion mechanism.

Detailed explanation-4: -Epithelial layers contain no blood vessels (avascular), so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane. Cell junctions are especially abundant in epithelial tissues.