That’s not what happens. What can happen is that if you grab a live conductor and get electrocuted, your hand cramps up leaving you holding the damn thing unable to let go because you have no control over your muscles anymore. Electricity is so dangerous because electric signaling via your nerves is also how you move your muscles. But voltage is voltage, your muscles don’t know it’s external, they react anyway.
That includes muscles in your heart, which you need to work according to signaling from your nerves, not to cramp up randomly. If your heart stops pumping because you are being electrocuted, it doesn’t pump blood anymore and your brain dies of oxygen starvation pretty quickly.
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