Why do hospitals inject saline into your bloodstream instead of just water?
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The saline they inject is the same saltiness-level as your blood (the fancy medicine word is “isotonic”). If they injected just water, it would be less salty than your blood and therefore dilute your blood salt levels. Your blood is salty for a reason, so messing up the salt levels by adding pure water is (usually) bad. By adding saline instead, they can add fluid volume without changing the existing salt level.
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