If a person gets an injury and has major blood loss they get a transfusion. How come their blood doesnt just replenish? If someone donates blood how come they dont need a transfusion after? In both scenarios people are losing blood but why cant someone who lost blood from an injury just naturally make more blood to fix that?
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It does replenish by itself, but it takes time. If you’re bleeding out faster than you can make new blood, you need some help.
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