Unlike the action potential in skeletal muscle cells, the cardiac action potential is not initiated by nervous activity. Instead, it arises from a group of specialized cells known as pacemaker cells, …

The movement of electrically charged particles – which occurs during the spread of the cardiac action potential – generates an electrical vector. The depolarization propagates through the …

The top image is a graph depicting the action potential of a cardiac myocyte plotted against membrane potential and time. The action potential phases are clearly illustrated to emphasize …

May 12, 2025 · In this post, we’ll dive into the physiology of the cardiac action potential, focusing on how calcium influx is the key bridge between electrical excitation and mechanical contraction.

Jun 8, 2025 · In this article, we will look at how action potentials spread in ventricular cells, their shape and modulation in disease states. In order to understand ventricular action potentials, it …

Nov 26, 2025 · Cardiac Action Potential Phases: Diagram of pacemaker vs non-pacemaker cell action potentials and their ions explained.

In the cardiac myocyte, the membrane potential is dominated by the K+ equilibrium potential. An action potential is initiated when this resting potential becomes shifted towards a more positive …

Jan 25, 2021 · In order for the heart muscle to actually contract, the physiological process of excitation-contraction coupling must occur via an action potential propagated through the …

Apr 28, 2020 · The action potential of a cardiac myocyte has five distinct phases: Phase 0 (rapid depolarisation), Phase 1 (early repolarisation), Phase 2 (plateau), Phase 3

There are three general types of cardiac action potentials that are distinguished, in part, by the presence or absence of spontaneous pacemaker activity and by how rapidly they depolarize.