What is the primary movement of solutes in the process of dialysis?

The primary movement of solutes in the process of dialysis is from an area of high solute concentration to an area of low solute concentration. This process is driven by diffusion, where molecules move spontaneously from regions of higher concentration to areas of lower concentration until equilibrium is achieved. In dialysis, this principle is utilized to remove waste products and excess solutes from the blood when the kidneys are unable to perform this function effectively.

The movement across a semipermeable membrane is also an important characteristic of dialysis, as it allows for selective transfer of solutes while retaining larger molecules, such as proteins, in the bloodstream. This natural tendency for solutes to balance concentrations on either side of the membrane explains why solutes will migrate from high to low concentration during this process. The role of capillary walls pertains more to general physiological processes and does not define the specific mechanism driving solute movement in dialysis.