Why is it possible to flex my muscles without moving my joints. E.g hold my fingers open and flex my forearm muscles
In: 2
Muscles only exert usable force when they contract, pulling two anchor points closer together. This is fine for moving a joint one direction but if you want it to go back you will need a second muscle.
If both of these opposing muscles are contracted in unison then they can balance out, not moving the joint at all. This is how you can contract a muscle without movement.
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