O-LevelBiologyCoordination & Response5090/12 · Oct/Nov 2018 · Q241 Mark

The diagram shows the elbow joint in two different positions. [Figure 24.1] What happens to the muscles to change the position of the elbow joint as shown above?

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Amuscle Y: contracts, muscle X: contracts

Bmuscle Y: contracts, muscle X: relaxes

Cmuscle Y: relaxes, muscle X: contracts

Dmuscle Y: relaxes, muscle X: relaxes

✓ Correct answer

C: muscle Y: relaxes, muscle X: contracts

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 24.

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