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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You need to have a blood pressure within a certain range for your organs to function properly. If there is no blood available for a transfusion, you should at least add some water to the system.
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