Question

Explain how muscles bring about movement in our arms

Answer 1

Explanation:

Movement is produced by the contraction of muscles which then move the bones at the attachments and that is how the body is able to move. The muscles work in pairs. When one of them contracts, the bone is pulled in that direction, the other muscle of the pair relaxes. ... A muscle can only pull.

Answer 2

Answer:

There are two sets of muscles present in the upper arm called biceps and triceps. When you raise your hand, the biceps become shorter and harder while the triceps become softer and longer. Similarly, when you lower your hand, the triceps become shorter and harder while the biceps become longer and softer.