can any one explain me the meaning of this sentence..
osmosis is defined as the special diffusion of solvent (water in this context) from the soltuion of lower concentration to the solution of higher concentration when both are seperated by a semipermeable membrane..
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The sentence is long and maybe a little awkward, but basically it makes sense. The key to understanding it is to think about water on the molecular basis.
First think about the static (unchanging) system. The water molecules are in two different compartments - you can think of it as inside a cell and outside a cell if that makes it easier. The concentrations of other small ions in each compartment is different. On one side of the 'membrane' or in one compartment, the concentration of these ions is relatively high; the concentration of ions in the other compartment is relatively low.
Before I go on, does that make sense?
ok i only get that u have taken two compartments having potential gradient in terms of charge
That's the important part of the system: that a gradient (it could be a potential or electrical gradient. It could also be a simple concentration gradient) exists between the two different compartments.
The next thing to do is think about how molecules behave in that gradient. The membrane between the two compartments is what we call "semi-permeable." That means it is a boundary the ions cannot cross but the water molecules can cross. So the individual water molecules flow down their concentration gradients across the membrane.
This is passive transport - it's energetically favorable and requires no input of energy. "Osmosis" is simply the special term which means "passive transport of water."
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ok.. one line in this making me frustrate plz explain this
"osmosis is defined as the special diffusion of solvent (water in this context"
its a v.wierd line i didnt get wat they are tring to say a lil..
The word "diffusion" is a little abstract. In this context it basically means "passive transport." It covers the case in which you have a concentration gradient across a single compartment (i.e., more ions on one side of the same compartment and fewer on the other).
I think they used the word "special" to indicate that "osmosis" refers to passive transport of water, not anything else.
ok.. thnx bye..
nw i have to do physics in bio and chem i m done .. :)
Good luck with it!
Are u confused about the use of word "Special"? Then see.
Basically, what I have read about osmosis is the above definition u have given. The thing is it is basically a diffusion process only. But the special conditions are that it requires the movement of water molecules from a medium of lower concentration to a medium of higher concentration through a semi - permeable membrane.
On the other hand, diffusion refers to movement of any particle from higher concentration to lower concentration( Example is diffusion of oxygen into our body).
that i know it is the basic definition of osmosis but i need the meaning in refernce to my statement but its solve noe thnx for help
I think 1 picture is better than 1000 words!!!