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first heart sound, AV valves close
o
second heart sound, semilunar valves close
p
ekg
n
aortic pressure
i
left ventricle pressure
g
left atrial pressure
k
av valve closes
j
aortic valve opens
f
contraction phase
b
aortic valve closes, ventricular systole
h
relaxation phase
d
av valve opens
l
ventricular volume
m
ventricular diastole
f-g
SA node initiates atrial depolarization
P
complete atrial depolarization, delayed impulse at AV node
PR
ventricular depolarization begins at apex, atrial repolarization occurs
QRS
ventricular depolarization is complete
ST
ventricular repolarization begins at apex
T