Intrapleural Pressure during forceful expiration is

Intrapleural Pressure: (ITP) / Intrathoracic Pressure It is the pressure within pleural space (space between visceral and parietal pleura) At beginning of inspiration = -2.5 mm Hg / - 5 cm H2O At end of inspiration = - 6.0 mm Hg / - 10 cm H2O At end of expiration = - 2.5 mm Hg / - 5 cm H2O Forceful inspiration = - 20 mm Hg Forceful expiration = + 20 to  + 30 mm Hg