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.
Keep practising Breathing and Exchange of Gases
Browse all Breathing and Exchange of Gases questions for AP Intermediate 1st Year, or explore more Biology topics.
Related questions
Which cartilaginous part of the airway is called the sound box?During swallowing, which flap covers the glottis to keep food out of the larynx?Frogs can respire through their moist skin. This is known as:Respiration using vascularised gills, as in most aquatic arthropods, is called what?Earthworms exchange respiratory gases mainly through which structure?Breathing bingoWhich is biggerHow each gas travels