Exchange of carbon dioxide occurs because blood in the pulmonary capillaries has a higher partial pressure of carbon dioxide than atmospheric air does. Therefore, carbon dioxide diffuses out of the plasma into the lung. Hence, the answer is true.
The pulmonary capillaries are thin-walled (just about one cell thick) blood vessels that are found in the lungs, or more specifically, close to the alveoli (air sacks) to enable gaseous exchange between the blood plasma and the atmospheric air. In order to understand how gaseous exchange works in the pulmonary capillaries, we need to understand how gases behave.
Air is made up of gases. Air also exerts pressure on the surfaces they come in contact with. According to Dalton's law, this pressure can be gotten by adding up the partial pressure of the indivigual gases in air. The more the concentration of that gas, the more the partial pressure that gas will have. If the partial pressure of a gas is higher in one area, the gas tends to remove to concentration gradient by diffusion.
In the pulmonary capillary, the partial pressure of carbon dioxide is about 45mmHg, while the partial pressure of carbon dioxide in atmospheric air is about 40mmHg. This difference in partial pressures causes carbon dioxide to diffuse out of the blood plasma. Therefore, the answer to the question above is true.
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