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 is the highway your body uses to transport oxygen and some other stuff to the organs and muscles to keep them functional. while the body does make blood over time, it takes time as well as water ingestion. a person who has quickly lost a large amount of blood cannot regenerate it in time to prevent death. they require it immediately or their systems will shut down and they will die.
tldr can’t make more blood fast enough in such instances
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