Ion pumps are specialized proteins found in cell membranes that help move ions, such as sodium and potassium, across the membrane. They use energy, often from ATP, to transport these ions against their concentration gradient, which is essential for maintaining the cell's internal environment and functions. These pumps play a crucial role in various physiological processes, including nerve impulse transmission and muscle contraction. By regulating ion concentrations, ion pumps help ensure that cells can communicate effectively and respond to stimuli, contributing to overall bodily function and homeostasis.