Sinoatrial node - Wikipedia
The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells.
Conducting System of the Heart - SA Node - TeachMeAnatomy
2023年4月24日 · Sinoatrial Node. The sinoatrial (SA) node is a collection of specialised cells (pacemaker cells), and is located in the upper wall of the right atrium, at the junction where the superior vena cava enters. These pacemaker cells can …
Sinoatrial node: definition, location, function - Kenhub
2023年10月30日 · The sinoatrial node, better known as the sinuatrial or SA node is the key structure responsible for the generation of a regular heartbeat and is therefore often referred to as the pacemaker of the heart.
Anatomy and Function of the Heart's Electrical System
An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). This is a small mass of specialized tissue located in the right upper chamber (atria) of the heart.
Overview of Sinoatrial and Atrioventricular Heart Nodes
2019年7月18日 · Sinoatrial (SA) Node The sinoatrial node, also referred to as the pacemaker of the heart, coordinates heart contractions. Located in the upper wall of the right atrium , it generates nerve impulses that travel throughout the heart wall causing both atria to contract.
Function of the Heart's Electrical System - Cleveland Clinic
2022年3月17日 · The sinoatrial (SA) node is a cluster of cells that act as a natural pacemaker for your heart. The SA node is located in a wall of the right atrium of your heart. This step is where the upper chambers of the heart begin to squeeze.
Sick Sinus Syndrome: Symptoms, Causes and Treatment. - Cleveland Clinic
Sick sinus syndrome is a problem with your sinoatrial (SA) node, which sends signals to your upper heart chambers. Atrioventricular (AV) block is a problem with your AV node, which sends signals to your lower heart chambers.
Heart Conduction: What Is It & How It Works - Cleveland Clinic
2021年7月23日 · The SA node is in the upper part of your heart’s right atrium. It is at the edge of your atrium near your superior vena cava (vein that brings oxygen-poor blood from your body to your heart). Your autonomic nervous system controls how fast or slowly your SA node sends electrical signals.
Sinoatrial nodal pause, arrest, and exit block - UpToDate
2022年2月21日 · Sinus pause, arrest, and exit block may arise from hyperkalemia; excessive vagal tone; ischemic, inflammatory, or infiltrative or fibrotic disease of the SA node; sleep apnea; certain drugs (eg, digitalis). The causes of SND are discussed in detail elsewhere.
Sinoatrial Node Action Potentials - CV Physiology
Cells within the sinoatrial (SA) node are the primary pacemaker site within the heart. These cells are characterized as having no true resting potential, but instead generate regular, spontaneous action potentials.