a thin piece of wood or other rigid material used to immobilize a fractured or dislocated bone, or to maintain any part of the body in a fixed position. 2. one of a number of thin strips of wood woven together to make a chair seat, basket, etc.
If you take a close look at epithelial cells using a microscope, you will see them tightly packed together. This helps make a protective barrier for our bodies. There are also some special door-like connections between each epithelial cell called gap junctions. The gap junctions are where the cells exchange nutrients.
Report Abuse. that's because it is a respiratory surface and theoretically, must be moist. the actual reason is so that the oxygen can be dissolved in that moisture and absorbed, thus gaseous exchange.trixc Â· 7 years ago. Thumbs up.xygen is what the lungs are trying to absorb, but at the same time the lungs function as something of a barrier to solids. The membranes of the epithelial and endothelial cells don't pose a barrier to the movement of this oxygen and the carbon dioxide that needs to be exhaled.