Question

A Styles Paragraph Sensitivity Hant Po, 160 Po 0.3 Po = 120 Poy 27 Alys PCO, 40 Poy 1640 Po 40 Peo - 45 Po, 104 Poo - 40 Pulmonary capillary Oxygenduses into the arterial ands of pulmonary capillaries, and CO2 diffuses into the alveoll because of differences In partial pressures. As a result of diffusion at the venous ends of pulmonary capillaries, the Po, in the blood is equal to the Po, in the alveoll, and the Peo, in the blood is equal to the Pco in the alveoll. Poor 40 Blood pulmonary veine Right Lali The Poo, of blood in the pulmonary veins Is less than in the pulmonary capillaries because of mixing with deoxygenated blood from veins dahing the bronchi and bronchioles. Heart Tissue capillary Po, 40 Poor-45 POU Poor Oxygen duses out of the arterial ends of tissue capillaries, and CO. diffuses out of the because of differences in partial pressures. As a result of diffusion at the venous ends of tissue capillaries, the Po, in the blood is equal to the Pos in the issue, and the Pro In the blood is equal to the Peo in the time Go back to step 1. Internal fluid Pe 40 Po - 40 Peo - 45 Peo45 1) Why is the Poz in expired air ((Por) of 120 mmHg) greater than the PO2 of the air in the alveoli (PO2= 104 mmHg)? 145% ge 1 of 1 26 words Focus

Answer 1

Po2 in expired air is higher than alveolar air due to dead space effect. Dead space is the air present in the conducting system which is not involved in gas exchange. So the expired air has more o2 than alveolar air.