Question

When we lift a heavy object :-

• A. Triceps contracts and biceps relaxes
• B. Both biceps and triceps contracts
• C. Both biceps and triceps relaxes
• D. Biceps contracts and triceps relaxes

Answer 1

The correct option is D Biceps contracts and triceps relaxes

When the triceps muscle contracts, the biceps muscle relaxes and the arm straightens. As triceps muscles are not as powerful as the biceps, it does not have to exert great force to straighten the arm.
Thus, the biceps exerts force to straighten the arms and lifting a heavy object. So to lift an object Biceps muscle contracts and triceps muscle relax.