* Equilibrium implies a static state where no net movement occurs. In true equilibrium, there's no difference in concentration of solutes across the membrane, and therefore, no movement of water molecules.
* Osmosis maintains a dynamic steady state. Water molecules constantly move across the cell membrane, but the net movement is balanced. This means the concentrations of solutes inside and outside the cell remain relatively constant.
Think of it like this: Imagine a bathtub with a small hole at the bottom. Water constantly flows out of the hole, but you also continuously pour water into the bathtub. This creates a steady state where the water level in the tub remains relatively constant. This is similar to osmosis - water is constantly moving in and out of the cell, but the net movement keeps the internal environment stable.
Therefore, while osmosis contributes to homeostasis, it doesn't achieve true equilibrium. Instead, it maintains a dynamic steady state, where the cell's internal environment is kept within a narrow range.
