Some of the events during a cardiac cycle are listed.
1. Left and right atria contract.
2. Left and right ventricles contract.
3. A wave of electrical activity is conducted by the Purkyne tissue.
4. A wave of electrical activity passes through the atrioventricular node.
What is the correct sequence of events after the sinoatrial node sends out a wave of electrical activity?
1 )
1 → 3 → 4 → 2
1 → 4 → 3 → 2
3 )
2 → 4 → 3 → 1
4 )
4 → 1 → 3 → 2
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