alleryThe actual exchange of O₂ and CO₂ between blood and air happens at the
Aalveoli of the lungs
Btrachea, where air is humidified
Cbronchi, just below the larynx
Dpharynx, at the back of the throat
Answer & Solution
Correct answer: A. alveoli of the lungs
Alveoli are the dead-ends of the airway tree, with single-cell walls wrapped in capillaries.
Gas exchange happens by diffusion across this thin membrane.
The trachea, bronchi and pharynx belong to the conducting zone and don't exchange gases.
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