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The Human Body and Movement in Physical Activity and SportMuscular SystemAntagonistic PairsJoint Actions
AQA GCSE · Question 09.2 · The Human Body and Movement in Physical Activity and Sport
Identify the main antagonist at the elbow as the arm moves from A to B.
Identify the main antagonist at the elbow as the arm moves from A to B.
How to approach this question
The movement from A to B is elbow flexion, caused by the bicep (the agonist) contracting. The antagonist is the muscle that opposes this action by relaxing. Identify the muscle on the opposite side of the upper arm to the bicep.
Full Answer
Triceps
Muscles work in antagonistic pairs. For a movement to occur, one muscle (the agonist or prime mover) contracts, while the opposing muscle (the antagonist) relaxes. In elbow flexion (moving from A to B), the bicep brachii is the agonist that contracts. The triceps brachii, located on the back of the upper arm, is the antagonist that must relax and lengthen to allow the movement to happen.
Common mistakes
Incorrectly naming the bicep as the antagonist, or naming a muscle not involved in this joint action.
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