Which sequence correctly describes the normal cardiac conduction pathway?
Correct answer: B. SA node, AV node, bundle of His, Purkinje fibres
- A. AV node, SA node, Purkinje fibres, bundle branches
- B. SA node, AV node, bundle of His, Purkinje fibres
- C. SA node, bundle branches, AV node, Purkinje fibres
- D. AV node, bundle of His, SA node, Purkinje fibres
Explanation
The impulse normally begins in the sinoatrial node, reaches the atrioventricular node, travels through the bundle of His and bundle branches, and then spreads through Purkinje fibres. The AV node briefly delays the impulse so the ventricles can fill before contracting.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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