O-LevelBiologyCoordination & Response5090/12 · May/June 2016 · Q191 Mark

How do the biceps and triceps muscles cause movement at the elbow joint?

Abiceps action: contracts, biceps effect: arm bends up, triceps action: contracts, triceps effect: arm straightens

Bbiceps action: contracts, biceps effect: arm straightens, triceps action: contracts, triceps effect: arm bends up

Cbiceps action: relaxes, biceps effect: arm bends up, triceps action: relaxes, triceps effect: arm straightens

Dbiceps action: relaxes, biceps effect: arm straightens, triceps action: relaxes, triceps effect: arm bends up

✓ Correct answer

A: biceps action: contracts, biceps effect: arm bends up, triceps action: contracts, triceps effect: arm straightens

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 2, question 19.

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