Your question can be read a few different ways.
If you are asking what happens to the bicep or tricep when they are extended as opposed to being contracted, then the muscle would be said to be relaxing.
Skeletal Muscles like the Bicep can only PULL, but they cannot PUSH.
After the bicep is done raising the forearm, it relaxes and waits for the antagonist muscle on the other side of the joint to extend the arm again so it can once more pull it closed.
Triceps Brachii extends the forearm at the elbow joint.
The biceps muscle relaxes!!!!!=)
-Flexion of the Arm -Flexion of the Forearm-Supination of the Forearm-Stabilization of the glenohumeral joint
The Biceps flex the elbow The Triceps extend the elbow
Biceps is a muscle that has two heads. It doens't really refer to a single muscle, because there are two biceps muscles. One is the biceps brachii which is one of the flexors of the elbow and the other is the biceps femoris, which extends the hip and flexes the knee.
None. Muscles only contracts. In order to extend, the muscle on the opposite movement has to contract. For example, the biceps help flex the elbow, but it does not extend the elbow; the triceps does that.
Triceps brachiiElbow flexion is due to the contraction of the biceps brachii, the prime mover. The triceps brachii extends as the biceps brachii contracts and therefore is the antagonist muscle.
When your biceps contract (and your triceps relax), your arm bends at the elbow. When your triceps contract (and your biceps relax), your arm straightens. The biceps and triceps enable you to bend or extend your arm at the elbow.
the biceps
Biceps brachii.
Biceps Biceps
The joints that the biceps are working with are the elbow joint and the shoulder joint.