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, that have …

The cardiac action potential originates from cells with pacemaker function, which is the ability to generate regular, spontaneous action potentials.

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 the process that …

Cardiac action potentials differ from the APs found in other areas of the body. Typical neural AP duration is around 1ms and those of skeletal muscle are roughly 2-5ms, whereas cardiac action potentials …

Oct 19, 2018 · About 1% of cardiac fibers are auto-rhythmic, meaning they have the special ability to depolarize spontaneously and control the pace of the heart. These auto-rhythmic cells initiate the …

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 (contractile cells).

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.

Myocardial conduction cells initiate and propagate the action potential (the electrical impulse) that travels throughout the heart and triggers the contractions that propel the blood.

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 and subsequent …

In skeletal muscle, the action potential is brief, and contraction follows quickly. In cardiac muscle, the action potential includes a longer plateau, and contraction is sustained for a longer duration, …