What is the primary function of the atrioventricular node in the mammalian heart?
Correct answer: D. Delaying conduction to ventricles
- A. Initiating atrial contraction
- B. Closing the semilunar valves
- C. Producing ventricular repolarization
- D. Delaying conduction to ventricles
Explanation
The atrioventricular node briefly delays the electrical impulse before it passes to the ventricles. This delay allows the atria to empty into the ventricles, while the semilunar valves close because of pressure changes rather than direct AV node action.
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