O-LevelBiologyCoordination & Response5090/11 · May/June 2012 · Q191 Mark
The diagrams show the positions of the bones of the forearm as it is raised. The muscles which move the bones are only shown in the first diagram. [Figure 19.1] What is the action of the muscles as the arm moves from the first position to the second and then to the third?
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Abetween 1 and 2 biceps: contracts, triceps: contracts; between 2 and 3 biceps: contracts, triceps: relaxes
Bbetween 1 and 2 biceps: contracts, triceps: relaxes; between 2 and 3 biceps: contracts, triceps: relaxes
Cbetween 1 and 2 biceps: relaxes, triceps: contracts; between 2 and 3 biceps: relaxes, triceps: contracts
Dbetween 1 and 2 biceps: contracts, triceps: relaxes; between 2 and 3 biceps: relaxes, triceps: relaxes
✓ Correct answer
B: between 1 and 2 biceps: contracts, triceps: relaxes; between 2 and 3 biceps: contracts, triceps: relaxes
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