The function of the atrioventricular node is to
A)excite the left and right atrium
B)control the heart rate
C)prevent the atria and ventricles from contracting simultaneously
D)repolarize the heart after systole
E)stimulate ventricular contractile cells directly

Question

Quizplus · Accepted Answer

The atrioventricular node is responsible for delaying the electrical impulses from the atria to the ventricles, preventing them from contracting at the same time. This delay ensures that blood is pushed into the ventricles before they contract, maximizing the efficiency of each heartbeat.

Answer: B 
 The atrioventricular node is also involved in controlling the heart rate by adjusting the delay between the atrial and ventricular contractions. This allows the heart to respond to changes in demand for oxygen and nutrients by increasing or decreasing the heart rate.

Therefore, both options C and B are correct.

The Function of the Atrioventricular Node Is to