Questions: Multiple Choice Question Alveolar air has a higher concentration of and a lower concentration of in comparison to capillary blood. O2 ; CO2 CO2 ; O2

The answer is the first one: \(\mathrm{O}_{2} ; \mathrm{CO}_{2}\).

Explanation:

1. \(\mathrm{O}_{2} ; \mathrm{CO}_{2}\): Alveolar air typically has a higher concentration of oxygen (\(\mathrm{O}_{2}\)) and a lower concentration of carbon dioxide (\(\mathrm{CO}_{2}\)) compared to capillary blood. This is because the primary function of the alveoli in the lungs is to facilitate the exchange of gases. Oxygen is inhaled into the alveoli and diffuses into the blood, while carbon dioxide, a waste product of metabolism, diffuses from the blood into the alveoli to be exhaled.

2. \(\mathrm{CO}_{2} ; \mathrm{O}_{2}\): This option is incorrect because it suggests that alveolar air has a higher concentration of carbon dioxide and a lower concentration of oxygen compared to capillary blood, which is contrary to the physiological process of gas exchange in the lungs.

In summary, the correct answer is that alveolar air has a higher concentration of \(\mathrm{O}_{2}\) and a lower concentration of \(\mathrm{CO}_{2}\) compared to capillary blood.