biceps and triceps
The leg curl and leg extension exercises strengthens two muscle groups. The two muscle groups are the hamstring muscles and the quads or quadricep muscles.
Muscles in your arm.These are the muscles of your upper arm.
forearm and upper arm muscles.
Circular and Longitudinal muscles.
deltoids; biceps,triceps
Jack divides his groups into two.
Abduction of the arm is caused by contraction of the deltoid and supraspinatus muscles, which pull the arm away from the body. This movement allows for raising the arm to the side and is important for various shoulder and arm activities. Injuries or neurological conditions affecting these muscles or their nerve supply can lead to difficulty with arm abduction.
there is only two muscles in the upper arm, the triceps and the biceps
The arm is made up of two main muscles (biceps & triceps) for the arm to move one of these muscles must contract and the other must relax. Which muscle does which depends on which way you are moving your arm.Additional answerThis does not mention the muscles in the forearm, which mainly move the hand, or the muscle in the shoulder, deltoid, which lifts the arm.
lobby group and advocaty group
The biceps flexes the arm it does not extend it (straightens). The triceps brachii extends the arm. They do work together. If one is damaged and doesn't work as it should, the movement will be "jerky" and not smooth.
It means that you naturally move your arm with out thinking that your going to move it. There are two types of muscles; voluntary muscles and involuntary muscles. Voluntary muscles are muscles that you think about to move sometimes and involuntary muscles are muscles that you don't think about moving. An example of an involuntary muscle would be your heart and an example of a voluntary muscle would be your arm even though you don't really have to think about it when you move it.