The following tissues carry an electrical impulse during the cardiac cycle.
1) atrioventricular node
2) muscle wall of atria
3) Purkyne tissue
4) sinoatrial node
In which order does the electrical impulse travel during the cardiac cycle?
1 )
1 → 2 → 3 → 4
2 )
1 → 4 → 2 → 3
4 → 2 → 1 → 3
4 )
4 → 2 → 3 → 1
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