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Is water always able to diffuse through a Cell's selectively permeable membrane?
Osmosis Osmosis is the net movement of water across a partially permeable membrane from a region of high solvent potential to an area of low solvent potential, up a sol…ute concentration gradient.
The process by which water diffuses through a selectively permeablemembrane is called passive transport. Passive transport describes anet movement of molecules that requires n…o energy.
It's called osmosis. A selectively permeable membrane will only allow certain molecules to pass trough. To illustrate: If you have a high concentration of sugar mole…cules on one side of the membrane, no sugar on the other side, and the sugar molecules are too big to pass trough the membrane. If this is the case, then water molecules will diffuse over to the side of the membrane with a high sugar concentration. This happens because the molecules try to distribute themselves evenly in the solution. The water molecules move because the sugar molecules can't.
Water diffuses by facilitated diffusion, passing through water permeable protein channels embedded in the cell membrane. Water molecules can not pass through the lipid bilayer… because water is polar. However, polar molecules pass though the cell membrane through the protein channels. The proteins that aid water in passing through the cell membrane are called aquaporins. "Aqua" for water, and "porin" for pore. A "water pore" in essence.
Osmosis is the term for the diffusion of water through a selectively permeable membrane.
Diffusion without a concentration gradient; osmosis with.
This is the process of osmosis. The membrane allows a solvent (usually water) to move from an area with lower solute concentration to one with greater concentration.