Since the blood arriving in the pulmonary capillaries has a P _ _ 2 } of, on average, 45 mmHg ( 6 kPa ), while the pressure in the alveolar air is 105 mmHg, there will be a net diffusion of oxygen into the capillary blood, changing the composition of the 3 liters of alveolar air slightly.
12.
Since the blood arriving in the pulmonary capillaries has a P _ _ 2 } of, on average, 45 mmHg ( 6 kPa ), while the pressure in the alveolar air is 105 mmHg, there will be a net diffusion of oxygen into the capillary blood, changing the composition of the 3 liters of alveolar air slightly.
13.
The American Medical Association concludes in its " Manual for Chemical Tests for Intoxication " ( 1959 ) : " True reactions with alcohol in expired breath from sources other than the alveolar air ( eructation, regurgitation, vomiting ) will, of course, vitiate the breath alcohol results . " For this reason, police officers are supposed to keep a DUI suspect under observation for at least 15 minutes prior to administering a breath test.
