You might have predicted that since the water molecules in the cells had morefree energy than those in the saturated salt solution, more water molecules would leavethan would enter the cell, causing the cell volume to shrink. In distilled water, the watermolecules outside the cell will have more free energy than those inside and thus morewater molecules enter than leave the cell. This causes the cells to bloat as they take upwater, but despite the elasticity of the cell membrane, they have a finite ability to increasein size. At some point, the cells will "pop" much like over-inflating a balloon. We callthis phenomenon cell lysis.So water can pass through the cell membrane with relative ease. How easily canother substances pass through the cell membrane? And if we hypothesize that there are"pores' in the membrane and that these substances are moving through these membranepores, do different sized molecules enter cells at different speeds?
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