A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2016 · Q321 Mark
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 what order does the electrical impulse travel during the cardiac cycle?
A1→2→3→4
B1→4→2→3
C4→2→1→3
D4→2→3→1
✓ Correct answer
C: 4→2→1→3
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