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 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 …

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.

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 …

The action potential includes a depolarization (activation) followed by a repolarization (recovery). The action potential occurs in all cardiac cells but its appearance varies depending on cell type.

Cardiac action potential (AP) is defined as a small voltage change (approximately 0.1 V) that initiates the contraction of cardiac myocytes, enabling the orderly spread of electrical excitation …

In summary, while skeletal muscle action potentials rely primarily on sodium and potassium ions, cardiac muscle action potentials involve sodium, calcium, and potassium ions.

Nov 26, 2025 · This lecture focuses on action potentials in the heart, called cardiac action potentials. This includes the action potentials of pacemaker cells and non-pacemaker cells …

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 …

The cardiac muscle cells have a much different action potential. In this case, there is a rapid depolarization, followed by a brief repolarization and plateau phases, ending with a full …