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Large vein that carries blood into Right Atrium
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Terms in this set (36)
Mass of cardiac Conduction Tissue in posterior wall of right Atrium just inferior to entrance of Su*erior Vena Cava, also known as hearts natural pacemakerSinoatrial Node (SA)Receives AP from SA Node, delays them briefly (smaller fiber Diameter), and relays them on to Cardiac Conduction Tissue Ventricles. Located in Inferior part of interatrial Septum just superior to Tricuspid Valve.Atrioventricular Node (AV)Carries APs from AV Node into Interventricular Septum. located inferior part of Interatrial Septum. Only electrical connection between Atria and Ventricles.Atrioventricular BundleDivision of AV Bundle that carry APs through Interventricular Septum toward Apex of Heart.Right & Left Bundle BranchesNetwork of large Cardiac Conduction Fibers that extend from Right and Left Bundle Branches, and carry APs to Cardiac Muscle Fiber in Walls of Ventricles, stimulating them to contract nearly simultaneously as a single unit.Purkinje FibersStimulated and Contract just before Cardiac Muscle fibers in lateral walls of ventriclesPapillary MusclesIrregular Heart rhythmArrhythmiaRapid, uncoordinated Atrial or Ventricular contraction -> Ineffective pumping actionFibrillationElectrically shocking heart Depolarize entire Myocardium and restore Sinus Rhythm, Required during Ventricular FibrillationDefibrillationAbnormal Pacemaker; takes over control of heart rate if SA Node is damagedEctopic FocusElectrolyte Imbalances, Hypoxia, Toxic Reaction to drugs, or too much caffeine or Nicotine can lead toTemporary Ectopic FocusSmall upward wave caused by Atrial Depolarization which spreads from SA Node throughout both AtriaP WaveAV Node becomes Pacemaker, if ECG showsInverted or lost P waveEnlarged Atrium as in Mitral Stenosis (Narrowing of Mitral/Bicuspid Valve) causing back up of blood in left Atrium -> expansion of Atrial wall, Indicated by ECG asLarger than normal P WaveEnlarged Ventricles, if ECG showsLarger than normal R wavePossible Myocardial Infarction, if ECG showsLarger than normal Q WavePossible Hyperkalemia (elevated blood K+ level), Indicate ECG showsLarger than normal T WaveHypoxia of Cardiac Muscle, indicate ECG showsSmaller than normal T WavePossible Heart damage due to accumulated scar tissue showing impulse conductionLengthened P-R IntervalTime required for Impulse to travel (SA Node) from Atrial Depolarization through Ventricular Depolarization.P-R IntervalAll events associated with flow of blood through heart during one complete heartbeatCardiac CycleContraction phase of Cardiac muscle is known asSystoleRelazation phase of Cardiac Muscle, in both Atria and Ventricles Is known asDiastoleAbnormal sound occuring just before, between, or after "Lup-Dup". Common in young healthy children and in some elderly people with thinner heart walls that vibrate as blood rushes through heart, but usually indicates valve prolemHeart MummurLeak (due to incomplete closure) and allow backflow of blood.Incompetent ValvesThose with narrowed opening, restrict bloodflowStenotic Valves