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.
Introduction. Photosynthesis is the process by which plants use the energy in sunlight to synthesize material from air and water for growth. In this process violet light is absorbed by chlorophyll, the energy obtained splits water, and oxygen gas is given off by the reaction. 2H 2 O(l) = hydrogen + O 2 (g). The hydrogen remains in the leaf and participates in further reactions. The experiment described here is designed to show that sunlight causes green leaves to produce oxygen.