<prompt> At the sta of inspiration, the intrapleural pressure at the base of the lungs is1.5 mm of Hg1 mm of Hg2.5 mm of Hg6 mm of Hg  <response>: At the sta of inspiration intrapleural pressure of the lung is 2.5 mm HG Ref: guyton and hall textbook of medical physiology 12 edition page number:316,317,318 