PRINCIPIOS FÍSICOS DEL INTERCAMBIO GASEOSO Aire atmosférico (mmHg) Aire humidificado (mmHg) Aire alveolar (mmHg) Aire espirado (mmHg) N2N2 O 2 CO 2 H 2 O 597.0 159.0 0.3 3.7 563.4 149.3 0.3 47.0 569.0 104.0 40.0 47.0 566.0 120.0 27.0 47.0 (78.62%) (20.84%) (0.04%) (0.50%) (74.09%) (19.67%) (0.04%) (6.20%) (74.9%) (13.6%) (5.3%) (6.2%) (74.5%) (15.7%) (36%) (6.2%) 760.0 (100.0%) (Tomado del Guyton) PRESIONES PARCIALES DE LOS GASES RESPIRATORIOS A NIVEL DEL MAR