Final answer:
Red blood cells swell in hypotonic solutions and shrink in hypertonic solutions.
Explanation:
Red blood cells behave differently in different types of solutions. In a hypotonic solution, the red blood cell swells and can potentially burst (hemolysis) due to more water flowing into the cell than out. In contrast, in a hypertonic solution, the red blood cell loses water and undergoes crenation (shriveling).
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