Water is unique. It will move to regions where there’s less water so because there’s less water there.
Let’s say you put a red blood cell into distilled water. Distilled water is pure water, like 100% water. The rbc, while having a large content of water, will have a lower water content, and thus distill water will enter the rbc and eventually cause it to burst
If by chance put a rack load of salt into the distilled water, it is no longer just pure water (as it’s now salt water). If it just happens that you but so much salt into the water, that now if you put a rbc into the salt water, the water content of the rbc would be greater in the rbc rather than the salt water. As said before, water will move to regions where there’s less water, so water would leave the rbc and enter the salt wayer, causing the rbc to shrivel
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