Which sequence of letters correctly identifies the order of events during the cardiac cycle?
T atrial walls contract
U impulse is delayed by a fraction of a second
V wave of excitation enters the atrioventricular node
W wave of excitation passes down the Purkyne tissue
X wave of excitation spreads from the sinoatrial node
Y ventricles contract

1 )
A
2 )
B
C
4 )
D
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