How can the process of diffusion be best described?

The process of diffusion is best described as the movement of solute from an area of high concentration to an area of low concentration. This concept is fundamental in understanding how substances move across cell membranes and within biological systems.

In diffusion, molecules are constantly in motion, and when there is a concentration gradient, where one area has a higher concentration of solute compared to another area, the molecules will naturally move toward the area of lower concentration until equilibrium is reached. This passive process does not require energy input, as it relies on the inherent kinetic energy of the molecules.

This principle is not only important for understanding how nutrients, gases, and waste products are exchanged at the cellular level but also underlies many physiological processes, such as respiration and the functioning of the kidneys in filtering blood.