The given diagram shows air sacs and associated blood vessels in the human lung. The concentration of carbon dioxide is the highest in the part labelled as
Correct answer: B. B
- A. A
- B. B
- C. C
- D. D
Explanation
The only artery with greater CO₂ concentration is the pulmonary artery, as it carries deoxygenated blood, so B is correct. The pulmonary vein has a greater O₂ concentration. Capillary beds facilitate gaseous exchange. So A, C, and D are incorrect.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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