Which of these statements concerning the conduction system of the heart are true?
A) The sinoatrial (SA) node of the heart acts as the pacemaker.
B) The SA node is located on the upper wall of the left atrium.
C) The AV node conducts action potentials rapidly through it.
D) Action potentials are carried slowly through the atrioventricular bundle.
E) Both the sinoatrial (SA) node of the heart acts as the pacemaker and the SA node is located on the upper wall of the left atrium are true.

Question

Quizplus · Accepted Answer

The sinoatrial (SA) node, located in the right atrium, not the left, acts as the heart's pacemaker by setting the rhythm of electrical impulses that cause the heart to beat. The AV node does not conduct action potentials rapidly; instead, it delays them to ensure that the atria have ejected their blood into the ventricles before the ventricles contract. Action potentials are carried rapidly through the atrioventricular bundle, not slowly, to ensure efficient heart function.

Which of These Statements Concerning the Conduction System of the Heart