Epithelial tissue consists of densely packed cells. It is either
simple or stratified, based on the number of cell layers. Simple epithelium has
one layer of cells, while stratified epithelium has multiple layers. Epithelial
tissue may have squamous-, cuboidal-, or columnar-shaped cells. Squamous cells
are flat, square cells. Cuboidal cells
form a box or cube. Columnar cells are stacked, forming a column taller than
they are wide. There are two surfaces to epithelial tissue: one side is firmly
attached to the underlying structure, while the other forms the lining. The
epithelium forms a barrier, allowing the passage of certain substances, while
impeding the passage of other substances.
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