What correctly describes an event in the cardiac cycle that follows atrial systole?
1 )
A wave of excitation passes through the sinoatrial node (SAN), before spreading down to the base of the septum.
2 )
Electrical impulses pass from the muscles of the atria to the muscles of the ventricles to cause ventricular systole.
Electrical impulses pass through conducting fibres, which cause a delay before spreading to Purkyne tissue.
4 )
The opening and closing of the semilunar valves occurs later than the opening and closing of the atrioventricular valves.
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