Intrinsic Conduction System of the Heart Intrinsic Conduction System of the Heart A very important property of cardiac muscle is automaticity, which is that cardiac muscle is capable of electrically stimulating itself in the absence of neural information and does so in a rhythmic pattern Input from the autonomic nervous system (sympathetic &. parasympathetic divisions) does NOT set the heart rhythm, instead the ANS modifies the rhythm according to the body/s needs. The specialized cells found in the sinoatrial node (SA node) usually regulate the cycling of the entire heart. This makes the SA node the pacemaker of the heart. It dominates the rest of the heart because its cells depolarize more rapidly that other cardiac muscle fibers and it causes them to depolarize based on its rhythm. The wave of depolarization initiated by the SA node spreads across the heart utilizing the gap junctions between the cardiac cells. After spreading across the atrial walls, the wave stimulates the atrioventicular node (AV node) and is carried to the ventricles via the AV Bundle (Bundle of His), bundle branches, and Purkinje fibers. These are the components of the heart's conducting system. Identify the following components of the conducting system of the heart in order of the direction of electrical activity. Electrical System of the Heart Take Quiz direction of electrical activity. Electrical System of the Heart 1 [Choose] v[ Choose ] Purkinje fibers Internodal pathways Left and right bundle branches Atrioventricular (AV) node AV bundle AKA bundle of His Sinoatrial (SA) node.

1. Intrinsic Conduction System of the Heart
Intrinsic Conduction System of the Heart A very important property of cardiac muscle is
automaticity, which is that cardiac muscle is capable of electrically stimulating itself in the
absence of neural information and does so in a rhythmic pattern Input from the autonomic
nervous system (sympathetic &. parasympathetic divisions) does NOT set the heart rhythm,
instead the ANS modifies the rhythm according to the body/s needs. The specialized cells found
in the sinoatrial node (SA node) usually regulate the cycling of the entire heart. This makes the
SA node the pacemaker of the heart. It dominates the rest of the heart because its cells depolarize
more rapidly that other cardiac muscle fibers and it causes them to depolarize based on its
rhythm. The wave of depolarization initiated by the SA node spreads across the heart utilizing
the gap junctions between the cardiac cells. After spreading across the atrial walls, the wave
stimulates the atrioventicular node (AV node) and is carried to the ventricles via the AV Bundle
(Bundle of His), bundle branches, and Purkinje fibers. These are the components of the heart's
conducting system. Identify the following components of the conducting system of the heart in
order of the direction of electrical activity. Electrical System of the Heart
Take Quiz direction of electrical activity. Electrical System of the Heart 1 [Choose] v[ Choose ]
Purkinje fibers Internodal pathways Left and right bundle branches Atrioventricular (AV) node
AV bundle AKA bundle of His Sinoatrial (SA) node