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.
When plants photosynthesize they release oxygen into the atmosphere. This oxygen comes fromwater in the cells of leaves and is initially released intospaces inside leaves (see Figure 1). The oxygen thenmoves from leaves into the atmosphere through smallholes on the leaf surface called stomata (singular:stoma).his oxygen comes fromwater in the cells of leaves and is initially released intospaces inside leaves (see Figure 1). The oxygen thenmoves from leaves into the atmosphere through smallholes on the leaf surface called stomata (singular:stoma).