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An elbow is a joint that helps you bend your arm.
Yes your tricep and bicep both work together to help bend your arm.
when you bend your arm
Triceps does not help to bend your arm. It helps to straighten your upper limb across the elbow.
You bend it backwards. Or bend it behind your back.
No. Try and feel. Only triceps is contracted, biceps bend the arm over the elbow joint.
You can use it to the extent that you use it to bend your arm. If you're asking if you can strike your opponent with your elbow... no, that would be against the rules.
No you can not.
at the elbow. "Flexion of the arm" just means to bend it.
your elbow
you spine
When you bend your arm at the elbow, your hand will move towards your shoulder.