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Where Is the SA Node Located?

[Summary]Sinoatrial node The sinoatrial node (often abbreviated SAN; also commonly called the sinus node and less commonly the sinuatrial node) is the normal natural pacemaker of the heart and is responsible for the initiation of the cardiac cycle (heartbeat)

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Sinoatrial node

The sinoatrial node (often abbreviated SAN; also commonly called the sinus node and less commonly the sinuatrial node) is the normal natural pacemaker of the heart and is responsible for the initiation of the cardiac cycle (heartbeat). It spontaneously generates an electrical impulse, which after conducting throughout the heart, causes the heart muscle to contract.

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Where Is the SA Node Located?

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What determines the rhythm of your heart?

The SA node sets the rhythm of your pulse and the AV node sets the rhythm of your heart contractions. Learn how the SA node and the AV node work.

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CV Physiology | Normal Heart Rhythm

Normal Heart Rhythm

The rhythm of the heart is normally determined by a pacemaker site called the sinoatrial (SA) node located in the posterior wall of the right atrium near the superior vena cava. The SA node consists of specialized cells that undergo spontaneous generation of action potentials at a rate of 100-110 action potentials ("beats") per minute. This intrinsic rhythm is strongly influenced by autonomic nerves, with the vagus nerve being dominant over sympathetic influences at rest. This "vagal tone" brings the resting heart rate down to 60-80 beats/minute. The normal range for sinus rhythm is 60-100 beats/minute. Sinus rates below this range are termed sinus bradycardia and sinus rates above this range are termed sinus tachycardia.

Where in the heart is the sinoatrial node located? | Socratic

The heart has its own intrinsic regulating system called the conduction system, that generates and distributes electrical impulses over the heart to stimulate cardiac muscle fibers or cells to contract. This rhythmic contraction distributes blood to tissues.

The conductive system begins at the sinoatrial node (SA node). This node (located in the superior wall of the right atrium) starts each cardiac cycle by initiating an electric impulse.

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