• Cover & line most body surfaces
• Always overlie connective tissue (CT)
– are attached to the CT by a basement membrane (kind of like double-sided tape, with one side sticking to the epithelial tissue & the other sticking to the connective tissue)
• Always have a free surface (termed the apical surface)
• Are avascular (lacks a blood supply)
• Cells are tightly packed & joined by intercellular junctions (usually tight junctions)
Epithelial Tissue Terminology
• Simple – single layer of cells
• Pseudostratified columnar – single layer of columnar cells that includes basal cells; appears stratified but is actually a simple epithelial tissue
• Stratified – multiple layers of cells
• Squamous – thin & flattened cells
• Cuboidal – cube-shaped cells
• Columnar – column-shaped cells
Answer the questions below by clicking on "Quiz Me."
Special Features Associated with Epithelial Tissue
• Microvilli – increases surface area for absorption
• Cilia – propels materials across the surface of the cells/tissue – typically mucus, but not always
• Goblet Cells – wine-glass shaped cells that produce mucus
Take the information above and put it together. In the first activity, you will place each picture on the correct simple epithelial tissue.
In this activity, you will place each picture on the correct stratified epithelial tissue.
Think about what a typical epithelial tissue looks like. Try putting the structures in order in this next activity.
In this activity, remember what the tissue looks like and try to deduce it's function:Think about the pictures of the epithelial tissues. If a tissue contains a goblet cell, what might be it's function? What if the cells making up the tissue were thin and flat? Use this principle to deduce the functions and pair them with the correct epithelial tissues.
Now that you've paired the tissue with it's function can you deduce where you might find that tissue? Where is diffusion most important? Where would the ability to stretch come in handy?