Solutes

Tonicity is the concentration of only the solutes that cannot cross the membrane, as only these solutes exert an osmotic pressure upon that membrane. Permeant solutes do not affect tonicity; impermeant solutes do affect it.

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Hi Potatoes are not made exclusivety of water of course. Solutes moves via facilitated diffusion through chanels oriented by gradient of concentration.

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yes... you're right plasmodesmata 11. I always think about the movement of solutes and not the water... Sorry my mistake

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... occur. So far I understand that increased motility decreases absorption time in the intestine, which results in high concentration of unabsorbed solutes in the intestine. Water follows the high concentration of solutes to maintain the osmotic gradient. Electrolytes in the intestinal lumen are ...

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... to proliferate in high and low water activity (hyper and hypotonic conditions). Many organisms respond to hypertonic environments by accumulating solutes.

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