Gas Exchange

Gas Exchange Quiz

Spec 8.3–5B · Edexcel GCSE Biology: Quiz

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5 questions, one answer each

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  1. 1. Which is NOT an adaptation of alveoli?

    • A. Thin one-cell wall
    • B. Large surface area
    • C. Thick muscular wall
    • D. Good blood supply

  2. 2. Direction of CO2 movement at alveoli?

    • A. Blood into alveolar air
    • B. Alveolar air into blood
    • C. No movement
    • D. Blood into muscle

  3. 3. Halving concentration difference (others constant)?

    • A. Stays same
    • B. Doubles
    • C. Halves
    • D. Zero

  4. 4. Thickened alveolar walls, unchanged SA/gradient. Effect on rate?

    • A. Increases
    • B. Decreases
    • C. Stays same
    • D. Decreases due to SA

  5. 5. Alveolus X: double SA, half thickness vs Y (same conc diff). Rate comparison?

    • A. Same as Y
    • B. Twice as fast
    • C. Four times as fast
    • D. Half as fast

Quiz