When electricity is applied to a muscle it contracts and stays contracted as long as enough current is passing through it.

An electric current passing through your body will cause your muscles to contract. Your heart is a muscle and will be under extreme stress while being electrocuted. The contraction will make it impossible for the heart to pump blood through the body.

However all the surrounding muscles and indeed all the muscles in your body will contract to some degree which can add further compression upon your chest limiting the space in your chest cavity and forcing your organs together.

If you are gripping onto a wire with enough current to electrocute you severely then it may be impossible for you to release your grip upon the live wire while being electrocuted.

Electric current in high enough voltages can burn your flesh along any paths the electricity takes as it passes through your body. Especially bad if it passing through a vital organ.
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