<prompt> True regarding Na ion -Responsible for Donnan effectResponsible for Resting membrane potentialResponsible for DepolarizationDoes not help other ions in transport  <response>: Depolarization occurs due to sodium ions influx.Potassium ions maintain the resting membrane potential.Sodium ions are not responsible for Gibbs-Donnan effect. It is due to the non-diffusible anions.Sodium ions take part in many co-transports. 