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.
Most plants grow from the tips of branches and roots where apical meristems produce new cells. As a result, in all buds, at the ends of all branch tips and on root tips, apical meristems are found. Apical meristems produce new cells that differentiate into three distinct embryonic tissues.