Which of the following statements correctly describe the process of gaseous exchange between alveoli and blood present in blood capillaries during exhalation?

Diffusion of carbon dioxide takes place from alveoli to blood

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Diffusion of carbon dioxide takes place from blood to alveoli

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Carbon dioxide concentration is higher in alveoli than blood

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Carbon dioxide concentration is higher in blood than alveoli

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Solution

The correct option is D Carbon dioxide concentration is higher in blood than alveoli
Alveoli are hollow air sacs surrounded by capillaries. During inhalation, the air in alveoli has a higher concentration of oxygen and hence oxygen passes through the wall of alveolus and then through the capillary wall into the blood. At the same time, blood present in blood capillaries is carrying a higher concentration of carbon dioxide that diffuses from blood into the alveoli. The carbon dioxide in alveoli is carried out during exhalation.

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