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.
In the palisade layer, chloroplasts are lined in columns just below the epidermal cells, to facilitate the capture of light. The spongy layer is a tissue that also contains chloroplasts and other parenchyma cells, but the cells are less ordered and spread out, leaving large intracellular spaces. These intracellular spaces, along with the moist surface of mesophyll cells, facilitate the exchange of carbon dioxide and oxygen.