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  • Pacemaker - American Heart Association
    How does a pacemaker work? The sinus node is the heart’s natural pacemaker It’s a small mass of specialized cells in the top of the right atrium (upper chamber of the heart) It produces the electrical impulses that cause your heart to beat A chamber of the heart contracts when an electrical impulse or signal moves across it
  • Cardiac Pacemaker Cells - Cardiac Cycle - TeachMePhysiology
    Pacemaker Cells Cardiac pacemaker cells are mostly found in the sinoatrial node (SAN), which is situated in the upper part of the wall of the right atrium These cells have natural automaticity, meaning they can generate their own action potentials
  • Sinoatrial node - Wikipedia
    The sinoatrial node (also known as the sinuatrial node, SA node, sinus node or Keith–Flack 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
  • 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
  • How the SA Node Sets the Heart’s Rhythm - ScienceInsights
    The heart’s ability to circulate blood relies on a perfectly timed, rhythmic contraction This dependable rhythm is established by the heart’s own electrical system, which continuously generates and transmits impulses At the center of this system is the sinoatrial node, or SA node, a specialized cluster of cells that acts as the primary electrical conductor The SA node initiates the
  • Regulation of Pacemaker Activity - CV Physiology
    The SA node displays intrinsic automaticity (spontaneous pacemaker activity) at a rate of 100-110 action potentials (“beats”) per minute This intrinsic rhythm is primarily influenced by autonomic nerves, with vagal influences being dominant over sympathetic influences at rest This “vagal tone” reduces the resting heart rate down to 60-80 beats min The SA node is predominantly
  • Physiology of the Heart – Boundless Anatomy and Physiology
    The heart's activity is dependent on the electrical impulses from the sinoatrial (SA) node and atrioventricular (AV) node, which form the intrinsic conduction system of the heart The SA and AV nodes act as a pacemaker for the heart, determining the rate at which it beats, even without signals from the larger nervous system of the human body The SA and AV nodes initiate the electrical





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