During gaseous exchange in the lungs, carbon dioxide moves
- A. from the alveolar air into the blood
- B. from red blood cells into haemoglobin
- C. from the blood into the alveolar air
- D. from the plasma into the lymph
Explanation
Venous blood arrives with a higher CO2 pressure than alveolar air, so the gas diffuses out to be exhaled. The opposite direction would defeat the entire purpose of ventilation.
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