Which of these events will happen if the connection between the SA node and the AV node becomes blocked
A)The ventricles will beat faster.
B)The stroke volume will increase.
C)The ventricular rate of contraction will not be affected.
D)The ventricles will contract more slowly.

Question

Quizplus · Accepted Answer

If the connection between the SA node and the AV node becomes blocked, the AV node will take over as the pacemaker of the heart, causing the ventricles to contract more slowly than they would if they were being paced by the SA node. Therefore, the correct answer is D. The other options are incorrect: A is incorrect because the ventricles will not beat faster; B is incorrect because an increase in stroke volume requires a change in contractility, which is not affected by the blockage of this connection; C is incorrect because the ventricular rate of contraction will be affected by the blockage.

Which of These Events Will Happen If the Connection Between