9700/13 Biology May Jun 2016 Online Test | Cambridge AS and A Level MCQ
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)…