Which muscle relaxes when the arm extends?
Understand the Problem
The question is asking about the muscle that relaxes when the arm is extended. In order to answer, we need to identify which muscle has this function during the action of extending the arm.
Answer
biceps
The final answer is biceps.
Answer for screen readers
The final answer is biceps.
More Information
When the arm extends, the triceps muscle contracts to straighten the arm, making the biceps the antagonistic muscle that relaxes.
Tips
A common mistake is confusing the roles of the biceps and the triceps. Remember that the biceps contracts to bend the arm, while the triceps contracts to extend it.
Sources
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