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because that's how the body is built
If your speaking about your biceps, it's because they don't start and end on your arm. Bi (2) Ceps Brachii has 2 heads. One of which originates on the coracoid process of the scapula. Both heads cross the elbow and insert on the radius. Thus because muscle pulls bones closer together, creating flexion, or bending the elbow. Same goes for triceps. Three heads, the long head originating on the scapula the other two on the posterior humerus (back of the arm). They insert on the elbow. This allows for extension of the arm and straightening the arm after bending the elbow.
http://www.exrx.net/Muscles/TricepsBrachii.HTML
What else can I help you with?
How do you move your arm?
With muscles!
What causes your arm to move?
the muscles
What happens when you move your arms but the muscle doesn't move?
Basically, All the muscles in your entire body can move.There's muscles that you can move on your own, and there's muscles that you can't.Nevertheless, these muscles that you can't move, move by itself.These muscles are called "The cardiac and smooth muscles.".Muscles that you are able to move on your own are "Skeletal muscles.".- Christofer Placencio, 01/31/13.
What does it mean when right arm moves without thought?
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.
What muscles do not move the upper arm?
Muscles that do not move the upper arm primarily include those that act on the forearm and wrist. Key examples are the brachialis, brachioradialis, and the muscles of the forearm, such as the flexor and extensor groups. Additionally, muscles in the shoulder region, like the rotator cuff muscles (except for the supraspinatus) and some of the pectoral muscles, stabilize the shoulder but do not directly move the upper arm itself.
How do your arm muscles work to lift a mug of coffee to your lips?
Your arm muscles work by contracting and releasing to lift a mug of coffee to your lips. The muscles flex and contract to move your arm.
Can you move your lower arm up and down?
Yes. lol If you have an elbow or your arm isn't broken you can move it!
What muscles are used to move the upper arm?
biceps and triceps
When you move the muscles of your lower arm which muscles of your body contract and relax?
biceps and triceps respectively
Function of the humerous?
The humerous is the upper arm bone. Its primary function is to support the arm muscles and allow the arm to move.
Which two muscle work in opposite way to make the arm move?
forearm and upper arm muscles.
Why are there upper and lower bands of muscles in the upper arm and lower arm in a chicken wing?
Because the chicken wing needs very many muscles to move its wing. The muscles work together when the bird is in flight to move the wing up and down.
