O-LevelBiologyCoordination & Response5090/11 · May/June 2010 · Q241 Mark

The diagram shows a person doing ‘pull ups' on a horizontal bar. In moving from the lower position X to the upper position Y, which muscles and joint movements occur? [Figure 24.1]

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Abiceps: contracts, triceps: relaxes, ball and socket joint: rotates

Bbiceps: contracts, triceps: relaxes, ball and socket joint: extends

Cbiceps: relaxes, triceps: contracts, ball and socket joint: rotates

Dbiceps: relaxes, triceps: contracts, ball and socket joint: flexes

✓ Correct answer

A: biceps: contracts, triceps: relaxes, ball and socket joint: rotates

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 24.

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