GENERAL HISTOLOGY

Detailed explanation-1: -The different types of epithelial tissues are characterized by their cellular shapes and arrangements: squamous, cuboidal, or columnar epithelia. Single cell layers form simple epithelia, whereas stacked cells form stratified epithelia. Very few capillaries penetrate these tissues.

Detailed explanation-2: -Basic Structure of Epithelia Epithelia are polarized, with an apical surface that faces the external environment and a basal surface that faces the basement membrane.

Detailed explanation-3: -The upper surface of epithelium is free, or exposed to the outside of the body or to an internal body cavity. The basal surface rests on connective tissue. A thin, extracellular layer called the basement membrane forms between the epithelial and connective tissue.

Detailed explanation-4: -An apical surface is a surface that faces the lumen which is the inner cavity of an organ. An organ of structure also has a basal side which faces the basement membrane and is commonly in contact with connective tissue or muscle tissue below it.

Detailed explanation-5: -Apical surface: it is the free surface that is exposed to external/internal environment, b. Basal surface: it is the surface that is attached, resting on connective tissue.