Your heart beat is regulated by your natural pacemaker, which generates small electric voltage. When you induce a small voltage, this fuks up the pacemaker, and in severe cases, causes fibrillation. The whole reason your heart works is through a steady rhythmic beat, its the different contraction that causes the blood to pump and create a flow.
Higher current causes the entire heart to contract at once, which also fuk up the rhythm.
If you do not bring the rhythm back (usually through a defibrillator), your heart fails to pump blood and you die.
Electricity also generate heat, the higher the resistance, the more heat is produced. Flesh, is not exactly conductive, so when a very strong electric shock passes through you, it will cook along the path.
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