Epithelial tissue can be subdivided into two main types: simple and stratified. Squamous epithelial tissue is characterized by its flat, scale-like cells, which can be found in areas where diffusion or filtration occurs, such as the alveoli of the lungs and the lining of blood vessels. Simple squamous epithelium consists of a single layer of these flat cells, while stratified squamous epithelium has multiple layers, providing protection in areas subject to abrasion, like the skin and the lining of the mouth.
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