Which structure normally acts as the primary pacemaker of the heart?
Correct answer: B. Sinoatrial node
- A. Atrioventricular node
- B. Sinoatrial node
- C. Bundle of His
- D. Purkinje fibres
Explanation
The sinoatrial node normally generates the fastest regular electrical impulses, so it sets the heart rate. The other structures conduct the impulse or produce slower backup rhythms rather than normally starting each heartbeat.
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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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