O-LevelBiologyTransport in Humans5090/11 · May/June 2010 · Q361 Mark

The diagram shows how the blood of a human embryo flows close to the mother's blood in the placenta. Which substances are present at X in higher concentrations than at Y? [Figure 36.1]

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Acarbon dioxide and glucose

Bcarbon dioxide and urea

Cglucose and oxygen

Dglucose and urea

✓ Correct answer

B: carbon dioxide and urea

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 36.

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