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14. During normal gas exchange the Po2 value in the alveolus is slightly higher than the Po2 value recorded in the venous blo

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The partial pressure of oxygen in alveoli is greater than the partial pressure of oxygen in the venous blood because the Po2 in alveolar air is 104mmHg,as the blood passes through the pulmonary capillaries and carbon dioxide is exchanged partial pressure of oxygen decrease, further oxygen exchange with the Carbon dioxide at the tissues decreases its partial pressure.

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