Pacemaker Physiology Review .pptx

Pacemaker Physiology Review .pptx - Pacemaker Physiology...

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Pacemaker Physiology REVIEW SESSION
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What do you know about electrical activity in the heart? What are common terms used when talking about electrical activity/impulses in the body?
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Key Terms: Autorhythmic Action potential Permeability Membrane potential Depolarization Repolarization Ions/ion channels Threshold
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Cardiac Conduction System Autorhythmic cells Modified cardiac muscle cells (Nodal cells) 1% of cardiomyocytes Function independently (influenced by ANS/hormones) “Pacemakers” Conduction pathway: SA node fires Electrical impulse spreads through myocardium of BOTH atria AV node fires Impulse spreads down AV bundle & bundle branches Purkinje fibers distribute impulse through myocardium in both ventricles
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Nodal Cell Action Potentials Unstable resting membrane potential Called “pacemaker potentials” Starts at about -60mV
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