Cardiac Impulse
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Cardiovascular
- Cardiovascular Overview
- CO2 Transport
- Heart
- Cardiac Impulse
- Blood Pressure
- Arteries and Arterioles
- Veins and Venules
- Capillaries
- Circulation
- Blood
- Hemoglobin
- Blood Clotting
- Topic Anchor: Cardiac Impulse
- Process
- Sinoatrial (SA) node
- Initiates action potentials and sets rhythm of the heart (pacemaker)
- → Atrioventricular (AV) node
- Conducts electrical impulses from atria to ventricles (hence, “atrio-ventricular”)
- → Bundle of His
- Carries electrical impulses from AV node to bundle branches between both ventricles
- → Purkinje fibers
- Conductive fibers in ventricular walls
- Allow for strong, unified contraction of ventricles
- Sinoatrial (SA) node
- Contractions spread to surrounding cardiac muscle via intercalated discs
- Cell connections with desmosomes and gap junctions
- Gap junctions allow rapid transfer of electrical impulses
- Cell connections with desmosomes and gap junctions
- Process