K224 / K225 / 2027

Respiration in humans

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Which route correctly takes inhaled air towards its main gas-exchange surface?

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Why does a continuous capillary blood supply help alveolar gas exchange?

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Cilia are damaged and mucus accumulates in the airways. Which explanation best links cause and effect?

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Which statement correctly describes aerobic respiration in a human cell?

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Why does a runner keep breathing rapidly and deeply after vigorous exercise?

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Question 1 of 5

Connect air and blood

Trace inhaled air from the larynx to an alveolus. Explain how three features of the alveolus and its capillary supply support gas exchange, including the net directions of oxygen and carbon dioxide.

Airway order first; then structure -> effect -> diffusion.

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