Simple squamous epithelial cells line blood vessels and lung alveoli, allowing transportation of substances through a selectively permeable surface.
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Because epithelial tissue forms a protective barrier, anything entering or leaving the body must cross it, playing a crucial role in regulating exchanges with the external environment and within the body.
Epithelial tissue cells are tightly packed, forming a continuous sheet with a small amount of cementing material between them and almost no intercellular spaces.
Epithelial tissues can be found in the skin, the lining of the mouth, the lining of blood vessels, lung alveoli, and kidney tubules.
Epithelial tissues cover most organs and cavities within the body, forming a barrier to keep different body systems separate and regulate the exchange of materials.