1) What is the primary pacemaker of the heart? a) Atrioventricular (AV) node b) Sinoatrial (SA) node c) Purkinje fibres d) Bundle of His 2) Which part of the cardiac conduction system delays the impulse to allow the atria to contract before the ventricles? a) SA node b) AV node c) Bundle of His d) Purkinje fibres 3) The SA node is located in the right atrium. a) True b) False 4) What does the QRS complex on an ECG represent? a) Atrial depolarisation b) Atrial repolarisation c) Ventricular depolarisation d) Ventricular repolarisation 5) Which part of the ECG corresponds to ventricular repolarisation?? a) P wave b) QRS complex c) T wave d) U wave 6) What is the sequence of electrical activation in the heart? a) AV node → SA node → Bundle of His → Purkinje fibers b) SA node → AV node → Purkinje fibers → Bundle of His c) SA node → AV node → Bundle of His → Purkinje fibres d) Bundle of His → SA node → AV node → Purkinje fibres 7) What does the P wave on an ECG represent? a) Ventricular repolarisation b) Atrial repolarisation c) Ventricular depolarisation d) b. Atrial depolarisation 8) What role do the Purkinje fibers play in the cardiac conduction system? a) Delay the impulse to allow atrial contraction b) Initiate the heartbeat c) Rapidly conduct the impulse to the ventricular myocardium d) Conduct the impulse to the AV node 9) The AV node serves as the backup pacemaker if the SA node fails. a) True b) False 10) The bundle of His is responsible for initiating the electrical impulse of the heart. a) True b) False

Cardiac conduction

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