Epithelial Tissue

Epithelial tissue, also known as epithelium, is sheets of tightly cells that line organs and body cavities and covers the body. Epithelial tissues are named according to the number of cell layers they have and by the shape of their cells on their free surface. A simple epithelium has a single layer, while stratified epithelium has multiple layers. The cell shape may be cuboidal, columnar, or squamous. The structure of each type of epithelium fits in function. For example, simple squamous epithelium lines the lungs’ air sacs; simple columnar epithelium lines the intestine. Human skin, pictured on the hand shown here, is a type of stratifies squamous epithelium, which is also found in esophagus lining. It has a thick layer of dead cells at the free surface. The protein keratin is deposited into these epithelial cells and makes our skin waterproof.

Advertisements

Leave a comment

Filed under Uncategorized

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s