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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Blood does replenish but if you’re losing it faster than you can make it or lost a lot at once you need a transfusion to get enough blood to stay alive long enough to fix the problem and then make enough more of your own. The body needs time and resources to make more blood and can compensate for small losses like a donation or minor wounds but anything more and it’s gonna need some help
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