A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2019 · Q311 Mark

The graph shows oxygen dissociation curves of haemoglobin at two different carbon dioxide concentrations. The partial pressure of oxygen in the lungs is 100 mmHg. The partial pressure of oxygen in metabolically active tissues is 35 mmHg. [Figure 31.1] What is the percentage saturation of haemoglobin with oxygen at the lungs and in metabolically active tissues?

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Alungs: 92, metabolically active tissue: 40

Blungs: 92, metabolically active tissue: 66

Clungs: 94, metabolically active tissue: 40

Dlungs: 94, metabolically active tissue: 66

✓ Correct answer

C: lungs: 94, metabolically active tissue: 40

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2019 Paper 1 Variant 2, question 31.

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