Final answer:
The physiological process that is most directly dependent on membrane potential is Movement. Membrane potential plays a crucial role in generating action potentials and facilitating muscle contractions.
Step-by-step explanation:
The physiological process that is most directly dependent on membrane potential is Movement. Membrane potential is the electrical potential difference across a cell membrane, which plays a crucial role in generating action potentials and facilitating muscle contractions. For example, in muscle cells, a change in membrane potential triggers the release of calcium ions, leading to muscle contraction and movement.