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How do muscles work?
Muscles move body parts by contracting and then relaxing.
A muscle can only pull bones, but not push them back. This is why muscles always work in pairs. One muscle contracts to bend or pull a body part while the other does the opposite.
Let's take an example : hold your arm straight in front of you. Bend your elbow. We are able to bend the arm, because one muscle named the biceps contracts and pulls the hand closer to our body while the other muscle named tricep relaxes..
Now when we straighten our hand, the bicep is relaxing whereas the tricep is contracting to pull the arm away from the body.
Thus, muscles always work in pairs. One muscle contracts while the other relaxes and vice-versa.
Updated on: 30-Mar-2023
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