Which of the following statements is true about movement of the forearm? In

  • A bending the arm, the biceps relax and the triceps contract
  • B bending the arm, the biceps contract and the triceps relax
  • C straightening the arm the biceps contract and the triceps relax
  • D straightening the arm, both biceps and triceps contract
waec 2005biology

The correct answer is B. bending the arm, the biceps contract and the triceps relax

To bend the arm, the biceps contracts and pulls on the radius. Simultaneously, the triceps relaxes.

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