Hypotonic, Isotonic, and Hypertonic Solutions
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State
A hypotonic solution draws water in; a hypertonic one draws water out; an isotonic one, matching the cell, moves no net water.
Show
A red blood cell swells in a hypotonic solution, shrinks in a hypertonic one, holds steady in an isotonic one.
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These terms are relative to the cell's own cytoplasm, never a property of the solution alone.