The skin is made up of stratified squamous epithelium, where cells are arranged in many layers to prevent wear and tear.
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Squamous epithelium can also be found in the lining of the esophagus, the lining of the mouth, and as part of the skin.
Simple squamous epithelial cells are extremely thin and flat, forming a delicate lining that facilitates the transportation of substances.
Simple squamous epithelial cells line blood vessels and lung alveoli, allowing transportation of substances through a selectively permeable surface.
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.