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This happens because the skin is just a covering of our body, but the veins carry oxygenated blood to our to the heart, and if this doesn't happen, a person's heart will not receive any oxygenated blood, and thus the person will die.

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if hand is not there means also the dexoygenated blood flow won't be there right..
But the veins are far more important than our hand.
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Yes,When we cut one's arm the person will not die as their blood doesn't start bleeding the person will only die when its veins are cut-off
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