Cervical spinal stenosis is the narrowing of the spinal canal in the neck. The spinal canal is the open area in the bones (vertebrae) that make up the spinal column.The spinal cord is a collection of nerves that runs through the spinal canal from the base of the brain to the lower back. Stiffness, pain, numbness, or weakness in the neck, shoulders, arms, hands, or legs. 2  Balance and coordination problems, such as shuffling or tripping while walking. 3  Cervical spinal stenosis can be crippling if the spinal cord is damaged.
Its singular form is called stoma, and it means 'mouth'. Stomata function is to regulate the process of photosynthesis, transpiration, respiration, etc. In this article we are going to discuss this structure and function in plants, which is an important part of plant biology. Positioning and Structure.
Plants can lose a lot of water via evaporation through the stomata, and open stomata also provide pathogens with a means for entering the plant. Two cells border each stoma (which is just a tiny hole in the leaf). These cells are called guard cells. Guard cells use turgor pressure to regulate the opening of stomata. When the plant wants to open its stomata, the guard cells take up ions (mostly K+ and Cl-) and sugars through ion channels and pumps. Because the solute concentration is now high inside the guard cells, water moves in and the cells expand. This expansion causes the guard cells to expand and puff out, opening the pore.