A-LevelBiologyGas exchange9700/12 · May/June 2023 · Q331 Mark
The diagram shows some of the events that happen between the plasma and the red blood cells in the circulatory system. [Figure 33.1] What do the numbers 1, 2, 3 and 4 represent?
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A1: Cl⁻, 2: HCO₃⁻, 3: H⁺, 4: CO₂
B1: CO₂, 2: HCO₃⁻, 3: H⁺, 4: Cl⁻
C1: HCO₃⁻, 2: Cl⁻, 3: CO₂, 4: H⁺
D1: CO₂, 2: H⁺, 3: HCO₃⁻, 4: Cl⁻
✓ Correct answer
B: 1: CO₂, 2: HCO₃⁻, 3: H⁺, 4: Cl⁻
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