O-LevelBiologyTransport in Humans5090/12 · Oct/Nov 2021 · Q191 Mark

Which diagram shows the diffusion of substances between the blood and dialysis fluid during dialysis? [Figure 19.1]

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ADiagram A showing net outward diffusion for glucose, salts, water, urea; protein retained.

BDiagram B showing net outward diffusion for glucose, water, urea; net inward for salts; protein retained.

CDiagram C showing net outward diffusion for salts, water, urea; net inward for glucose; protein retained.

DDiagram D showing net outward diffusion for salts, urea; glucose and water in equilibrium (two-way flow); protein retained.

✓ Correct answer

D: Diagram D showing net outward diffusion for salts, urea; glucose and water in equilibrium (two-way flow); protein retained.

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2021 Paper 1 Variant 2, question 19.

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