What Is the Simplest Type of Passive Transport?

What Is the Simplest Type of Passive Transport?

The simplest type of passive transport is diffusion or simple diffusion. Osmosis, which is also a form of passive transport, is similar to diffusion in that both move a substance from an area of high concentration to an area of low concentration.

Diffusion and osmosis do not require a cell's energy to move a substance. The difference is that in diffusion, the substance been moved is a solute, whereas in osmosis, it is water.

In diffusion, the movement of a solute continues until its concentration reaches equilibrium or eliminates the concentration gradient – that is, the concentration difference between the two areas. In osmosis, water molecules move across a semipermeable membrane until the concentration of both the water and solute are equal; in other words, the dilution of the solute particles has to occur.