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Question 66

A student bends an elbow and then straightens it. Which pairing correctly matches the main action of each named upper-arm muscle?

  1. Both chiefly extend the elbow
  2. Biceps extends; triceps flexes
  3. Both chiefly flex the elbow
  4. Biceps flexes; triceps extendsCorrect answer

Explanation

At the elbow, the biceps contributes to flexion, which decreases the angle, while the triceps contributes to extension, which increases it. Reversing those roles confuses the opposing actions of this familiar muscle pair.

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Question 66: A student bends an elbow and then straightens it. Which… · Human Body Systems · Questena