osmosis - from higher concentration to lower concentration across partially permeable membrane. applies to water.
active transport - from lower to higher concentration. energy is utilised during the process.
hey guys dont get confused....as khadija said.try to go to this website and see....
transporting from lower conc to higher conc thru selective permeable membrane....----osmosis
transporting from higher conc to lower conc----diffusion....
BE LIKE A PEARL....PRECIOUS AND RARE,NOT LIKE A STONE FOUND EVERYWHERE.......
Thanks for correcting me also.
dussamkumar, i think after all this discussion i understand why you said that the definition of osmosis varies from one source to another.
Here, i think it is important to note that when one is saying that osmosis is "transporting from lower conc to higher conc", it is with respect to the concentration of the solute.
I think that is why you were confused. Some put it the way I put: higher to lower and some put it as: lower to higher but with respect to solute concentration.
A diluted solution (in other words, a solution with low solute concentration) will have high water potential, while a concentrated solution (high solute concentration in given volume of water) has a lower water potential - so water will move from a diluted solution to a concentrated solution across a partially permeable membrane. Hence the definition "from lower to higher"
The definition cherryfda gave is perfectly correct
In addition, one of the best ways to understand both definitions (not explain them) is that ulimately the movement of the solvent takes place down the concentration gradient.
The query that now arises in my mind is "is osmosis only for water or for ALL solvents?"
Last edited by hamsternutz; 11-29-2006 at 07:21 PM.
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