Which muscle extends the elbow?

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Study for the Muscular System and Skeletal System Exam. Learn with flashcards and multiple choice questions, where each question has explanations and hints. Be well-prepared and confident on your test day!

Multiple Choice

Which muscle extends the elbow?

Explanation:
Elbow extension is produced by the triceps brachii. This muscle sits on the back of the upper arm and contracts to straighten the forearm by pulling on the olecranon of the ulna. The biceps brachii, in contrast, is a elbow flexor that bends the arm and rotates the forearm, not extend it. The pectoralis major moves the arm at the shoulder, not the elbow, and the abdominal muscles act on the trunk, not on the elbow joint. So, the triceps is responsible for extending the elbow.

Elbow extension is produced by the triceps brachii. This muscle sits on the back of the upper arm and contracts to straighten the forearm by pulling on the olecranon of the ulna. The biceps brachii, in contrast, is a elbow flexor that bends the arm and rotates the forearm, not extend it. The pectoralis major moves the arm at the shoulder, not the elbow, and the abdominal muscles act on the trunk, not on the elbow joint. So, the triceps is responsible for extending the elbow.

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