AV and SA Nodes: The Electical System that Lets Your Heart Work: Heart Nodes

AV and SA Nodes: Electrical System of the Heart

Coronary artery anatomy. a) Left coronary artery and b) Right coronary artery…

Coronary artery anatomy. a) Left coronary artery and b) Right coronary artery…

ATRIOVENTRICULAR NODE (AV NODE) - part of the electrical control system of the heart that coordinates the top of the heart. It electrically connects atrial and ventricular chambers. AV node is an area of specialized tissue between atria & ventricles of the heart, specifically in the posteroinferior region of the interatrial septum near the opening of the coronary sinus, which conducts the normal electrical impulse from the atria to the ventricles | Wikipedia

ATRIOVENTRICULAR NODE (AV NODE) - part of the electrical control system of the heart that coordinates the top of the heart. It electrically connects atrial and ventricular chambers. AV node is an area of specialized tissue between atria & ventricles of the heart, specifically in the posteroinferior region of the interatrial septum near the opening of the coronary sinus, which conducts the normal electrical impulse from the atria to the ventricles | Wikipedia

The Purkinje fibers, also known as subendocardial braches, are cardiomyocytes that are part of the conduction system of the heart. They lie beneath the endocardium and send impulses from the atrioventricular node to the ventricles causing them to contract. This ensures that the heart maintains its consistent rhythm. The Purkinje fibers were named after Jan Evangelista Purkyne, a Czechoslovakian anatomist that discovered these fibers in 1839.

The Purkinje fibers, also known as subendocardial braches, are cardiomyocytes that are part of the conduction system of the heart. They lie beneath the endocardium and send impulses from the atrioventricular node to the ventricles causing them to contract. This ensures that the heart maintains its consistent rhythm. The Purkinje fibers were named after Jan Evangelista Purkyne, a Czechoslovakian anatomist that discovered these fibers in 1839.

Red blood cells tightly packed in a capillary from the heart muscle. A small Purkinje fiber (blue) is present on the surface of the capillary. Purkinje fibers are modified cardiac muscle fibers that originate from the atrioventricular node and spread into the two ventricles. They transmit the electrical impulse from the atrioventricular node to the ventricles enabling an almost simultaneous contraction.

Red blood cells tightly packed in a capillary from the heart muscle. A small Purkinje fiber (blue) is present on the surface of the capillary. Purkinje fibers are modified cardiac muscle fibers that originate from the atrioventricular node and spread into the two ventricles. They transmit the electrical impulse from the atrioventricular node to the ventricles enabling an almost simultaneous contraction.

sympathetic and vagal effcts on atrioventricular node action potentials

sympathetic and vagal effcts on atrioventricular node action potentials

Overview of the Atrioventricular Node (AV Node)

Overview of the Atrioventricular Node (AV Node)

Electrical signals fire from multiple locations in the atria, causing abnormal quivering of the atria (1). The atrioventricular node — your heart's natural pacemaker — is unable to prevent all of these chaotic signals from entering the ventricles (2). Your ventricles respond to these extra, chaotic signals by beating faster than normal (3).

Electrical signals fire from multiple locations in the atria, causing abnormal quivering of the atria (1). The atrioventricular node — your heart's natural pacemaker — is unable to prevent all of these chaotic signals from entering the ventricles (2). Your ventricles respond to these extra, chaotic signals by beating faster than normal (3).

A normal heartbeat begins when a tiny cluster of cells called the sinus node sends an electrical signal

A normal heartbeat begins when a tiny cluster of cells called the sinus node sends an electrical signal

During normal sinus rhythm (NSR), the cardiac impulse originates in the sinus node in the atria and spreads through the atrioventricular node to the bundle branches in the ventricles (left). During atrial fibrillation, millions of wandering wavelets randomly migrate through the atria, producing an irregular heartbeat (right). (Infographic c/o Capital Cardiology)

During normal sinus rhythm (NSR), the cardiac impulse originates in the sinus node in the atria and spreads through the atrioventricular node to the bundle branches in the ventricles (left). During atrial fibrillation, millions of wandering wavelets randomly migrate through the atria, producing an irregular heartbeat (right). (Infographic c/o Capital Cardiology)

Sinoatrial node low magnification  The sinoatrial node works with the atrioventricular node to regulate heartbeat

Sinoatrial node low magnification The sinoatrial node works with the atrioventricular node to regulate heartbeat

It is essential to life for the heart to maintain a regular, rhythmic beat, producing a constant and maximal flow of blood to tissues throughout the body. This activity is controlled by the conduction system, beginning with the pacemaker function of the sinoatrial node (SA node). From here the impulse is sent to the atrioventricular node (AV node), where it then travels down the septum of the heart through the bundle of His where it branches into left and right bundles. READ ON

It is essential to life for the heart to maintain a regular, rhythmic beat, producing a constant and maximal flow of blood to tissues throughout the body. This activity is controlled by the conduction system, beginning with the pacemaker function of the sinoatrial node (SA node). From here the impulse is sent to the atrioventricular node (AV node), where it then travels down the septum of the heart through the bundle of His where it branches into left and right bundles. READ ON

File:Cystic tumour of the atrioventricular nodal region - high magnification  I selected this image as the atrioventricular node contributes to the regulation of heartbeat

File:Cystic tumour of the atrioventricular nodal region - high magnification I selected this image as the atrioventricular node contributes to the regulation of heartbeat

993.609.1: Lantern Slides, Pathology of the Heart. Diagrammatic representation of the conduction-system: 1, Sino-auricular node; 2, atrioventricular node; 3, bundle of His.

993.609.1: Lantern Slides, Pathology of the Heart. Diagrammatic representation of the conduction-system: 1, Sino-auricular node; 2, atrioventricular node; 3, bundle of His.

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