When you need a muscle to contract your brain sends a small electrical charge which tells the muscle to squeeze. All muscles contract using electrical pulses from your nerves. Your muscles can’t tell the difference between your nervous system’s electricity versus electricity coming from outside your body. So when electricity goes through your body from something like a power line all muscles along the way will contract and squeeze.
If you are gripping the item that’s causing electrocution you are now squeezing it super tight and with all the force your muscles can muster. Even if you weren’t holding the object the electricity is still going to force your muscles to be in a constant state of squeeze and that means you have no control over those muscles anymore. Many types of movement require at least one muscles to tense while another needs to relax, but having them all tense makes your ability to walk or do most actions impossible.
This is why people being electrocuted tend to have death grips and go stiff. The person can feel everything but they just have no control of their muscles because the electricity is completely overriding their muscles
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