O-LevelBiologyHuman Nutrition5090/11 · Oct/Nov 2011 · Q91 Mark

The diagram shows a bolus of food moving along the oesophagus. Which row describes the condition of the muscles at P, Q, R and S? [Figure 9.1]

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Acontracted, relaxed, contracted, relaxed

Bcontracted, relaxed, relaxed, contracted

Crelaxed, contracted, contracted, relaxed

Drelaxed, contracted, relaxed, contracted

✓ Correct answer

C: relaxed, contracted, contracted, relaxed

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Topic: Human Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2011 Paper 1 Variant 1, question 9.

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