What is osmosis defined as?

Osmosis is fundamentally defined as the diffusion of water through a selectively permeable membrane. This process occurs when water moves from an area of lower solute concentration (where there are fewer solutes) to an area of higher solute concentration (where there are more solutes) in order to balance concentrations on both sides of the membrane. The selectively permeable nature of the membrane allows water molecules to pass through while preventing the passage of certain solutes, which is a key feature distinguishing osmosis from general diffusion processes.

This definition highlights not only the movement of water but also the importance of the membrane's selective permeability, which is critical in biological systems for maintaining homeostasis within cells. Understanding osmosis is essential as it plays a vital role in processes such as nutrient absorption, waste removal, and regulation of cell volume, which are crucial for cellular function and overall physiological balance.