Causes of facet disease. Facet disease may arise when the cartilage in a facet joint is worn down as a result of aging, injury or wear and tear. This type of spinal damage can be attributed to arthritis, work, overuse or an injury sustained in an accident.acet disease occurs when a facet joint degenerates. While this can take place at any level of the spine, it most commonly affects the lumbar (lower spine) region. 1  Facet arthritis. 2  Facet joint syndrome. 3  Facet disease.
The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf. Cross section of a leaf, showing the anatomical features important to the study of photosynthesis: stoma, guard cell, mesophyll cells, and vein.
6. Use the general equation For photosynthesis and Model 1 to answer the Following questions. a. What are the reactants For photosynthesis? Carbon dioxide and water. b. Where do these reactants enter the leaF? CO2 enters through the under part of the leaf; water goes in through the central vein. c. Wha t are the products oF photosynthesis? Sugars and oxygen d. From where do the products leave the leaF? Oxygen exits through the under part of the leaf 7.