O-LevelBiologyCoordination & Response5090/12 · May/June 2015 · Q241 Mark

The diagram shows part of the elbow joint. [Diagram] Why are the muscles labelled X and Y described as antagonistic?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AThey both affect the same bone.

BThey have the same bending effect on two different bones.

CThey have opposite effects on the same joint.

DThey have opposite effects on different joints.

✓ Correct answer

C: They have opposite effects on the same joint.

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2015 Paper 1 Variant 2, question 24.

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