K325 / 2027

Respiration in humans

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

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The diaphragm flattens and the ribs move up and out. Which sequence follows?

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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 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

Trace air and clear mucus

Trace air from the larynx to an alveolus, naming each main airway. Explain what the nearby capillaries do and how mucus and cilia protect the larger airways.

Separate air conduction, blood flow and mucus clearance.

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