CardAP — KinFAST

Adaptive test — questions are selected based on your ability estimate. — Tag: SANodeVsMuscleAP

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A physiology student compares the action potentials recorded from a sinoatrial (SA) node pacemaker cell and a ventricular contractile cardiac muscle cell. Which combination of differences best distinguishes these two action potentials?

Both action potentials are nearly identical because all cardiac cells use the same channels and timing SA node action potentials have a long plateau phase, while ventricular action potentials lack a plateau entirely SA node cells depolarize via Cl- influx, while ventricular muscle depolarizes via H+ influx SA node action potentials show a slow spontaneous depolarization (pacemaker potential) from Na+ leakage and lack a sustained plateau; ventricular action potentials show rapid Na+ depolarization followed by a prolonged Ca2+-driven plateau before repolarization

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