The statements list some of the events in a cardiac cycle. The statements are not in the correct order.
Which statement describes the fourth of these events to occur in the cardiac cycle?
1- The impulse travels through Purkyne tissue.
2- A wave of excitation sweeps across the atria.
3- The atrioventricular node delays the impulse for a fraction of a second.
4- The sinoatrial node contracts.
5- The wave of excitation sweeps upwards from the base of the ventricles.
6- The ventricles contract.
7- The atria contract.
1 )
1
3
3 )
4
4 )
7
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