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.
Three Zones. There are three zones of cells in the root that correspond with different stages of primary growth. Right behind the root tip is the zone of cell division, which includes the root apical meristem. This is where new cells are produced, including those that make up the root cap.