Here's a breakdown:
* Solvent: The liquid that dissolves the solute. In most biological cases, this is water.
* Semipermeable membrane: A membrane that allows certain molecules to pass through while blocking others. This selectivity is based on size, charge, and other factors.
* Concentration: The amount of solute (dissolved substance) per unit of solvent.
* High solvent concentration: A solution with a relatively small amount of solute, meaning it has more solvent (water) per unit volume.
* Low solvent concentration: A solution with a relatively large amount of solute, meaning it has less solvent (water) per unit volume.
Why does osmosis happen?
Osmosis is driven by the tendency of systems to reach equilibrium. The water molecules will move across the membrane to try and equalize the concentration of the solute on both sides. In simpler terms, water will move from the area where it's more concentrated to the area where it's less concentrated to try to balance things out.
Examples of osmosis:
* Plants: Water moves from the soil into plant roots through osmosis.
* Red blood cells: Water moves in and out of red blood cells to maintain their proper shape and function.
* Kidney function: Water is reabsorbed back into the bloodstream through osmosis in the kidneys.
Important note: Osmosis is a passive process, meaning it does not require energy. It's driven solely by the concentration gradient.
