Diffusion Gradients of Respiratory Gases at Sea Level Partial pressure(mmHg) in Dry Alveolar Venous Diffusion Gas dry air air alr blood gradient Tota100.007600760 760 2O 0.00 0.0 00 20.93159.1105 0 65 CO20.030 40 46 79.04600.7569 573 60 NB. CO is -20X more soluble than o2 in blood = large amounts move into out of the blood down a relatively small diffusion gradient10 Diffusion Gradients of Respiratory Gases at Sea Level Total 100.00 760.0 760 760 0 H2O 0.00 0.0 47 47 0 O2 20.93 159.1 105 40 65 CO2 0.03 0.2 40 46 6 N2 79.04 600.7 569 573 0 Partial pressure (mmHg) % in Dry Alveolar Venous Diffusion Gas dry air air air blood gradient NB. CO2 is ~20x more soluble than O2 in blood => large amounts move into & out of the blood down a relatively small diffusion gradient