Biology

Difference between SA node and AV node

Main difference

The SA node and AV node are the main parts of the heart’s contractile system. The conductive system of a heart is the system of some component that forms an electrical conductive system, this system receives electrical impulses from the Pace Maker and passes them to the entire heart, the function of the conductive system is to transmit the impulse to maintain the contraction of the heart . The SA node is the first component of the heart’s conduction system. It is a small body of specialized muscle tissue in the wall of the right atrium of the heart. It produces the electrical impulse for what is called a Heart PaceMaker. The Pace Maker makes a steady rate of contraction of the heart and controls its contraction activity, transmits the signal to the AV node. The AV node is the second component of the conduction of a heart system. It is a group of cells that controls the heart rate by receiving an electrical impulse from the SA node. It is also one of the main components of the heart’s conduction system. The AV node is called the atrioventricular node. It is located in the center of the heart.

Comparative chart

SA node AV node
Abbreviation The SA node stands for sinoatrial node. The AV node stands for the atrioventricular node.
Also know as The SA node is known as the pacemaker of the heart. The AV node is also known as the pacemaker of the heart.
Heart conduction system The SA node is the first component of the conduction of a heart system. The AV node is the second component of the conduction of a heart system.
Controlled by The SA node is controlled by the autonomic nervous system (ANS). It is innervated by the parasympathetic nervous system by the vagus nerve. The AV node is controlled or influenced by impulses from the SA node.
Location The SA node is located on the superior lateral wall of the superior vena cava (SVC) opening. The AV node is located in the posterior septal wall of the right atrium, near the opening of the coronary sinus.
Beats per minute The SA node has an impulse discharge rate of nearly 90-100 beats per minute. The normal firing rate of the AV node is 40 to 50 times per minute.
What is the SA node?

The SA node stands for the sinoatrial node. It is the first component of the conduction of a heart system. It is a small body of specialized muscle tissue in the wall of the right atrium of the heart. It produces the electrical impulse that is why it is called Pace Makers by heart. The function of a pacemaker is to make a steady rate of contraction of the heart and to control its contraction activity. It transmits the signal to the AV node. The SA node is located on the superior lateral wall of the superior vena cava (SVC) opening. It is a longer structure that is flattened. What is interesting is that the SA node transmits direct impulses to both atria. The SA node is controlled by the autonomic nervous system (ANS). It is innervated by the parasympathetic nervous system by the VAGUS nerve.

What is the AV node?

The AV node stands for the atrioventricular node. It is the second component of the conduction of a heart system. It is a group of cells that controls the heart rate by receiving an electrical impulse from the SA node. It is also one of the main components of the heart’s conduction system. It is located in the center of the heart. The AV node is located in the posterior septal wall of the right atrium, near the opening of the coronary sinus. It is a shorter frame that has a medium oval outline. The AV node carries impulses to two ventricles through the AV bundle and its various branches. The AV node is controlled or influenced by impulses from the SA node. The AV node is also known as the pacemaker of the heart. The normal firing rate of the AV node is 40 to 50 times per minute. There are two pathways through the AV node;

SA node vs. AV node
  • The SA node represents the sinoatrial node, while the AV node represents the atrioventricular.
  • The SA node is known as the heart’s pacemaker, while the AV node is also known as the heart’s pacemaker.
  • The SA node is the first component of the conduction of a heart system. It is a small body of specialized muscle tissue in the wall of the heart’s right atrium, while the AV node is the second conduction component of a heart system. It is a group of cells that controls the heart rate by receiving an electrical impulse from the SA node.
  • The SA node is controlled by the autonomic nervous system (ANS). The parasympathetic nervous system is innervated by the vagus nerve and, contrary to it, the AV node is controlled or influenced by impulses from the SA node.
  • The SA node is located on the upper lateral wall of the superior vena cava (SVC) opening, on the other hand, the AV node is located on the posterior septal wall of the right atrium, near the opening of the coronary artery.
  • The SA node has a pulse discharge rate of nearly 90-100 beats per minute, while the normal discharge rate of the AV node is 40-50 times per minute.

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