Biology / Unit 2 Bio 0352 short lesson, about 20 seconds
"Isotonic Means the Same for Every Cell"
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The idea
Calling a solution isotonic without naming which cell it compares to drops the reference point the term depends on.
In practice
A solution isotonic to a red blood cell is not automatically isotonic to a plant cell, since their osmolarities differ.
Where people slip
Tonicity has no meaning stated alone — it describes a relation between one solution and one cell's cytoplasm.
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