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Cardiac Muscle cells are either contractile cells or autorhythmic cells. The majority are contractile.

Examples of autorhythmic cells:

  • Sinoatrial (SA), or Sinus, Node

  • Atrioventricular (AV) Node

  • Atrioventricular (AV) Bundle (occasionally referred to as the bundle of His)

  • Right and Left Bundle Branches

  • Purkinje Fibers

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How do the waves of depolarization generated by the autorhythmic cells spread to the muscle cells?

Autorhythmic cells in the heart generate electrical impulses that spread through the atria and ventricles via specialized conduction pathways, such as the atrioventricular node, bundle of His, and Purkinje fibers. These pathways allow for coordinated depolarization of the muscle cells, ultimately leading to contraction of the heart chambers.


What does auto-rhythmic mean?

Autorhythmic cells (pacemakers) refers to the cardiac muscle cells responsible for synchronizing the contractile cells to coordinate a heart contraction.


What does auto rhythmic mean?

Autorhythmic cells (pacemakers) refers to the cardiac muscle cells responsible for synchronizing the contractile cells to coordinate a heart contraction.


Where are autorhythmic cells located in the heart?

There are two pacemakers in the heart. One (which is the main pacemaker of the heart) can be found in the upper right-most part of the right atrium and the other one can be found in the center most part of the heart, inside the atrio-ventricular wall.


Does blood clott in anterior interventricular branch causes sudden death?

A blood clot, also called a thrombus, in the anterior interventricular branch causes sudden death. This branch supplies the majority of blood to the walls of both ventricles. The presence of a thrombus can block the bloodflow to heart muscle cells, causing instant death.


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