1 Tuberculous pleuritis may occur in some people who have the lung disease from tuberculosis.  The pleural disease occurs from the rupture of a diseased area into the pleural space, the space between the lung and the lining of the chest and abdominal cavities.
The root apical meristem is a region of growth tissue near the tip of each root. The meristematic cells in this region grow in two directions, both backward toward the above-ground shoot and forward toward the tip of the root.
1 meristem-a region of rapid mitosis, which produces the new cells for root growth. 2  root cap-a sheath of cells that protects the meristem from abrasion and damage as the root tip grows through the soil. meristem-a region of rapid mitosis, which produces the new cells for root growth. 2  root cap-a sheath of cells that protects the meristem from abrasion and damage as the root tip grows through the soil.