To extend the forearm at the elbow and extend the arm at the shoulder.
Extending your arm
The biceps and triceps. When the biceps contract, the triceps relax. If you can flex it, there's an opposite action happening somewhere.
Assists the triceps brachii in extension of the elbow
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.
The Triceps extend (Stretch out) as the biceps contract.
Triceps branchii.
triceps
The main muscle worked with dips is the triceps. The chest is also worked significantly and the farther you lean forward, the more chest is being involved.
A antagonist muscle is a muscle that opposes the action of another muscle. The Triceps Brachii is the antagonist of the Biceps Brachii.
Supinator. Also, as pronator teres also contributes to flexion of the elbow, that action is antagonized by the triceps.
I think you are referring to the triceps. This is the muscle that attaches at the elbow and the shoulder. The one that you use when extending your arm. biceps; up triceps; under
Triceps muscle has got medial head, lateral head and long head. Long head has got the origin from the infraglenoid tubercle. That means, when you contract the triceps muscle, long head gets support from the scapula bone. That gives additional support for the muscle to do the the action of extension on the elbow joint.
I don't believe that triceps curl is the correct term, as the triceps serve to extend the elbow joint rather than flex it. Triceps extensions, on the other hand, are generally used to train the triceps group, but they also benefit a rather small muscle, located almost on the elbow, called the anconeus. The function of the anconeus is to assist the main elbow extensors, the triceps, and to stabilize the elbow when the arm is straight.