O-LevelBiologyCoordination & Response5090/12 · May/June 2021 · Q241 Mark

The diagram shows how antagonistic muscles are arranged in the arm. [Figure 24.1] Which row describes the muscle action when the arm is straightened?

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Acontracts expands

Bcontracts relaxes

Cexpands contracts

Drelaxes contracts

✓ Correct answer

D: relaxes contracts

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2021 Paper 1 Variant 2, question 24.

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