the biceps contracts and the triceps relax
The biceps brachii muscle will contract, pulling the lower arm up.
biceps
Biceps flex the arm at the elbow, and triceps (along with the brachialis) extend it. The deltoids raise the arms.
when you bend your arm, your biceps contract, or tighten, and your triceps retract, or loosen. When you straighten your arm in a relaxed position, your triceps contract, and your biceps retract.
When the biceps contracts the triceps relaxes slowly. It happens when your arm is bent.
The primary function ofthe biceps brachi is suppination of the forarm, only when the forearm is suppinated does the biceps brachi assist brachialis in flexion of the elbow. The Triceps brachi is the only significant extensor of the elbow joint.
your triceps are working because it is the antagonist
it contracts
When the bicep contracts the triceps relax
forarm
The Triceps extend (Stretch out) as the biceps contract.