Biceps and triceps are what type of muscle

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Sports competitors and athletes are seen in action using their muscles. Muscles exert a force on bones when they contract. This happens for example when you lift or hold an object, or when you move a part of your body. If you hold an object weighing 10 N, keeping it still and with your forearm horizontal and your upper arm vertical, you would be exerting an upwards force of 10 N on the object. You could work out the force exerted by the biceps muscle to do this using the idea of moments.

For more on moments see Physics - Forces - Moments. Anatomists refer to the upper arm as just the arm or the brachium. The lower arm is the forearm or antebrachium. There are three muscles on the upper arm that are parallel to the long axis of the humerus, the biceps brachii, the brachialis, and the triceps brachii.

The biceps brachii is on the anterior side of the humerus and is the prime mover agonist responsible for flexing the forearm. It inserts on the radius bone. The biceps brachii has two synergist muscles that assist it in flexing the forearm. Both are found on the anterior side of the arm and forearm. One of these is the brachioradialis muscle which is largely on the forearm see the next section and the other is the brachialis , which is largely on the upper arm.

The brachialis muscle is deep to the biceps brachii and both its origin and its insertion are more distal to the shoulder than its equivalents on the biceps brachii. Like the biceps brachii, the origin of the brachialis is on the humerus bone and it inserts on the radius bone.