What features do epithelia have in common?
All epithelial tissues have these common characteristics:
- They form sheets of tightly bound cells or roll into tubes.
- Epithelial cells lie on the basement membrane.
- Epithelial cells have two different sidesapical and basolateral.
- The apical side always faces out of the body (outside or into a lumen).
How does epithelial tissue provide protection?
Epithelial tissues provide the body’s first line of protection from physical, chemical, and biological damage. The cells of an epithelium act as gatekeepers of the body, controlling permeability by allowing selective transfer of materials across its surface. All substances that enter the body must cross an epithelium.
What are the structural characteristics of epithelial tissue?
Despite there being many different types of epithelial tissue all epithelial tissue have just five characteristics, these are cellularity, polarity, attachment, vascularity, and regeneration. Cellularity as the name suggests means that the epithelium is made up almost entirely of cells.
What type of epithelium is most used for protection?
What are the features of epithelial cells?
Epithelial tissue is scutoid shaped, tightly packed and forms a continuous sheet. It has almost no intercellular spaces. All epithelia is usually separated from underlying tissues by an extracellular fibrous basement membrane. The lining of the mouth, lung alveoli and kidney tubules are all made of epithelial tissue.
What are the 7 characteristics of epithelial tissue?
Epithelial tissue is classified by cell shape and the number of cell layers.
What two characteristics are all epithelial tissues classified?
Epithelia are classified based on three criteria:
- Number of cell layers (simple or compound)
- Shape of surface cells (squamous, cuboidal or columnar)
- Specializations (cilia, keratin or goblet cells)