GENERAL HISTOLOGY

Detailed explanation-1: -Epithelial tissues are widespread throughout the body. They form the covering of all body surfaces, line body cavities and hollow organs, and are the major tissue in glands. They perform a variety of functions that include protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception.

Detailed explanation-2: -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.

Detailed explanation-3: -Epithelia are a continuous sheet of cells covering the surfaces of the body. They stand on a basement membrane which provides a site of attachment for the epithelium, and acts as a selective filtration barrier. There is very little intercellular material.

Detailed explanation-4: -Epithelial tissue provides a covering (skin, the linings of the various passages inside the body).

Detailed explanation-5: -Epithelia are continuous sheets of tightly linked cells that constitute the surfaces (such as the epidermis and corneal epithelium) and linings (such as the digestive, respiratory, and uro-genital epithelia) of the body.