A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2019 · Q321 Mark
The statements list some of the events in the cardiac cycle. They are not in the correct order. 1 The impulse travels through Purkyne tissue. 2 The ventricles contract. 3 The atrioventricular node delays the impulse for a fraction of a second. 4 The muscle tissue of the sinoatrial node contracts. 5 The wave of excitation sweeps upwards from the base of the ventricles. 6 A wave of excitation sweeps across the atria. 7 The atria contract. Which statement describes the second of these events to occur in the cardiac cycle?
A1
B4
C6
D7
✓ Correct answer
C: 6
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