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  • Sinoatrial node: definition, location, function | Kenhub
    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 It is the first component of the cardiac conduction system and is composed of specialized cardiac muscle cells, which are bundled together into a node within the right atrium These cells have
  • Anatomy and Function of the Hearts Electrical System
    How does the heart beat? 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 The sinus node generates an electrical stimulus regularly, 60 to 100 times per minute under normal conditions
  • Dear Doctor: What is sinus node dysfunction, and how is it . . .
    The sinus node may be too slow (sinus bradycardia), or it may fail to make an impulse for a period of time, or even permanently (sinus pauses and sinus arrest)
  • Conducting System of the Heart - Bundle of His - SA Node . . .
    Parasympathetic nervous system – decreases firing rate of the SA node, and thus decreases heart rate Atrioventricular Node After the electrical impulses spread across the atria, they converge at the atrioventricular node – located within the atrioventricular septum, near the opening of the coronary sinus
  • How the Sinoatrial (SA) Node Controls Your Heartbeat | Heart . . .
    Discover how the sinoatrial (SA) node, the heart’s natural pacemaker, generates electrical impulses to regulate heart rhythm Learn about its role in maintaining your heartbeat


















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