1. In the figure, label the 3 pressures. Parietal pleura Visceral pleura Transpulmonary pressure: 760 mm Hg -756 mm Hg =4 mm Hg Pleural cavity Thoracic wal Lung Diaphragm Intrapleural pressure is than atmospheric pressure and intrapulmonary pressure. 2. a) greater than b) equal to c) less than 3. When intrapulmonary pressure is lower than atmospheric pressure, you a) inhale b) exhale c) no air exchange Why is it important that the intrapleural pressure be maintained at about 4 mmHg below atmospheric pressure? 4.