Which muscle flexes the elbow?

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Prepare for the AFAA Group Fitness Instructor Test. Use flashcards and multiple choice questions, complete with hints and explanations. Get ready to ace your exam!

Multiple Choice

Which muscle flexes the elbow?

Explanation:
Elbow flexion is the action of bending the elbow, bringing the forearm toward the upper arm. The muscle that primarily causes this movement is the biceps brachii. When it contracts, it shortens and pulls on the forearm, creating the bending action at the elbow. It also helps rotate the forearm, but its main role here is elbow flexion. The other muscles listed don’t bend the elbow. The triceps works to straighten the elbow by extending it. The erector spinae runs along the spine and controls back movements, not the elbow. The rectus abdominis flexes the trunk, not the elbow.

Elbow flexion is the action of bending the elbow, bringing the forearm toward the upper arm. The muscle that primarily causes this movement is the biceps brachii. When it contracts, it shortens and pulls on the forearm, creating the bending action at the elbow. It also helps rotate the forearm, but its main role here is elbow flexion.

The other muscles listed don’t bend the elbow. The triceps works to straighten the elbow by extending it. The erector spinae runs along the spine and controls back movements, not the elbow. The rectus abdominis flexes the trunk, not the elbow.

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