A nurse explains why the atrioventricular node is important. Which statement is correct?
Correct answer: B. It delays the impulse before ventricular contraction
- A. It starts every heartbeat in the ventricles
- B. It delays the impulse before ventricular contraction
- C. It carries oxygenated blood to the myocardium
- D. It prevents blood from entering the pulmonary artery
Explanation
The AV node delays conduction between atrial and ventricular depolarisation, allowing time for ventricular filling. It does not start the normal heartbeat, which is the function of the SA node.
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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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