Understanding Cardiac Cycle Control

What is the primary function of the cardiac conduction system?

• To pump blood through the heart

• To generate and conduct electrical impulses

• To regulate blood pressure

• To filter blood

Which part of the cardiac conduction system is known as the natural pacemaker of the heart?

• Atrioventricular (AV) node

• Bundle of His

• Sinoatrial (SA) node

• Purkinje fibres

What is the role of the atrioventricular (AV) node in the cardiac conduction system?

• To initiate the heartbeat

• To delay the electrical impulse

• To contract the ventricles

• To supply blood to the heart muscle

Which structure in the cardiac conduction system conducts impulses from the AV node to the ventricles?

• Purkinje fibres

• Bundle of His

• Sinoatrial (SA) node

• Atrioventricular (AV) node

What is the sequence of electrical conduction in the heart?

• SA node → AV node → Bundle of His → Purkinje fibres

• AV node → SA node → Purkinje fibres → Bundle of His

• Purkinje fibres → Bundle of His → AV node → SA node

• Bundle of His → Purkinje fibres → SA node → AV node