The introduction of large doses of drugs into a vein is accompanied by their dilution with physiological saline

The introduction of large doses of drugs into a vein is accompanied by their dilution with physiological saline (0.9% sodium chloride solution). Explain why.

1) The internal environment of the body is characterized by the constancy of the composition of mineral salts.
2) The introduction of drugs in large quantities can change the composition of the internal environment, so they are diluted with saline.

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