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Cardiac Physiology

Lab Study Guide

lubb -come first -closure of AV valves
dupp -comes second -closure of SL valves
when ventricles contract AV valves open or close? close
when atria contract AV valves open or close? open
when ventricles relax AV valves open or close? open
when atria relax AV valves open or close? close
path of electrical activity - SA node -atrial contraction -AV node -AV bundle -R/L bundle branches -Purkinje fibers (conduction myofibrils) -ventricular contraction
systole contraction
diastole relaxation
p wave atrial depolarization (causes systole)
QRS complex ventricular depolarization (causes systole)
when do the atria repolarize? during the QRS complex but the large electrical activity of the ventricular depolarization masks atria repolarization
t wave ventricular repolarization (causes diastole)
significance of PQ segment -start of atrial depolarization to start of ventricular depolarization -measures time it takes to get from AV node to ventricles
significance of PR interval -time from atrial depolarization to beginning of ventricular depolarization -time to transmit action potential through entire conduction system -reflects whether impulse conduction from atria to ventricles is normal
significance of ST segment -normally remains isoelectric (no electrical activity) -interval between ventricular depolarization and repolarization
significance of QT interval includes all electrical events from ventricular repolarization to depolarization
cardiac cycle complete cycle of contraction and relaxation of all four chambers of the heart
R-R interval heart rate
calculating HR given cardiac cycle -HR = 60/CC -answer in BPM
calculating cardiac cycle given HR -CC = 60/HR -answer in seconds
wave electrical changes with depolarization and repolarization
segment (on line) between waves
interval wave and segment
Created by: studystack_0325



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