when you bang an arm or hand why do you temporarily lose strength in that area?

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when you bang an arm or hand why do you temporarily lose strength in that area?

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Your brain uses your nerves like a living Internet line to get signals from your arm/ hand and to tell it to move or what to do. This is a living line and if you hit it in the right spot it can get hurt or bruised just like any other living tissue all the way to being completely cut. This causes the signal to short circuit which can present like weakness or tingling or numbness. Sometimes the harder it is hit the longer it takes to recover