Impermeable

... it backward. The variable, in a cellular sense, is the solute concentration not the (water) solvent concentration. HyPOtonic means there's less impermeable solute in the water medium surrounding the cell. HypERtonic is when there is a higher impermeable solute concentration in the surrounding ...

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... as they are not present in high concentration inside the cell. If I am mistaken, isn't urea a large polar molecule? I thought they would be impermeable to membranes (unless facilitated by channels). We had a lab experiment on this, recording the haemolysis time of different solutions ... ...

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... permeable mebrane is a membrane that let everything go through. But for example even if cheesecloth would be quite close to this definition, it is impermeable to say lephants or bowling balls (at least the slow kind). So the notion of semi permeability is defined relatively to a class of objects, ...

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... is an extremely low value if you take in consideration that the skin is almost always in contact with air and it has a very large surface. Skin is impermeable to water and solutes but liposoluble substances (including gases) can pass.

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... into the cell, this is ignored when considering tonicity? The sucrose solutes however are non-penetrating particles (i.e. the RBC membrane is impermeable to sucrose) and is therefore the only solutes in the solution that are considered. 0.3m sucrose solution has an Osm of 300mOsm and this ...

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