part of membrane depolarization membrane depolarization during cardiac muscle cell action potential AV node cell action potential membrane depolarization during AV node cell action potential dph The process in which AV node cardiac muscle cell membrane potential changes in the depolarizing direction from the negative resting potential towards the positive membrane potential that will be the peak of the action potential. GO:0086045 2011-11-16T10:45:18Z biological_process membrane depolarization during atrioventricular node cardiac muscle cell action potential membrane depolarization during AV node cardiac muscle cell action potential