Which statements about the cardiac cycle are correct?
1- The atrioventricular valves close during atrial systole.
2- The left and right ventricles contract together.
3- There is a time delay as the electrical impulse passes from the atrioventricular node to the sinoatrial node.
4- Electrical impulses pass along the Purkyne tissue to the ventricles.
1 )
1, 2 and 3
2 )
1, 3 and 4
2 and 4
4 )
3 and 4 only
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