If the pO 2 of oxygen in the alveoli is 104 mmHg and in the blood in alveolar capillaries is 40 mmHg, while the pCO 2 in the alveoli 40 mmHg and in the blood is 46 mmHg, which of the following will happen? A. carbon dioxide will diffuse from the alveoli to the blood. B. oxygen will diffuse from the blood to the alveoli. C. oxygen will diffuse from the red blood cells to the plasma. D. carbon dioxide will diffuse from the blood into the alveoli.
Option D. Dissolved gases will diffuse from where there in excessive concen- tration to in which they're in low concentration. Hence CO 2 can pass from 46 mmHg to 40mmHg and pO 2 can circulate from in where it is at 104 mmHg to where it is at 40 mmHg.
