NBEO General Physiology Practice Exam

Water moves via osmosis towards a solution of higher osmolality. Osmosis is the process through which water molecules move through a semipermeable membrane from an area of lower solute concentration (and thus lower osmolality) to an area of higher solute concentration (and higher osmolality). This movement occurs in order to balance solute concentrations on both sides of the membrane.

When water is exposed to solutions, it naturally tends to dilute the more concentrated solution, which is the one with higher osmolality. By doing so, the overall concentration of solutes is made more equal across the membrane, highlighting the tendency of water to move toward regions with higher osmotic pressure. This principle is critical in various physiological processes, including the regulation of fluid balance in body cells and the function of kidneys in concentrating urine.