When infused into the body it acts (temporarily) to increase the blood volume, and bring up the blood pressure. People who have been severely injured and have bled a lot benefit from the "volume expander" which helps patients recover from shock until they get blood.
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Saline solution. A solution containing sodium chloride, potassium chloride, calcium chloride, and sodium lactate in distilled water, used as a topical treatment for wounds and burns. It is also used to culture animal cells.
Lactated Ringer's solution is 5% dextrose while the plain LR, as the name implies, is plain.. without dextrose..