O-LevelBiologyTransport in Humans5090/11 · Oct/Nov 2017 · Q151 Mark

The diagram shows capillaries with the direction of movement of materials. What is happening at points 1 and 2?

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A1: carbon dioxide leaves the blood, 2: urea enters the blood

B1: oxygen diffuses, 2: red blood cells return to the blood

C1: tissue fluid leaves the capillaries, 2: waste products enter the blood

D1: red blood cells move into the tissues, 2: carbon dioxide diffuses

✓ Correct answer

C: 1: tissue fluid leaves the capillaries, 2: waste products enter the blood

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2017 Paper 1 Variant 1, question 15.

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