- Epithelium is found lining all internal and covering all external body
surfaces. It also makes up glands.
- Its functions include protection, absorption, and secretion. It is
a selective barrier between the outside world (or internal lumen) and the
connective tissue underneath.
- The cells are packed together like tiles on a floor, which allows it
to serve as a barrier. Underneath it has a basal lamina which separates
the epithelium from the connective tissue.
- It is classified by whether or not it is layered (stratified vs. simple)
and by the shape of the cells (for stratified epithelium the uppermost
layer's shape determines classification). Some types, like pseudostratified,
transitional, and cytogenic don't quite
fit into this classification scheme and will be discussed in more detail
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