The cluster of cells commonly referred to as the "pacemaker" is known to anatomists as the
A) atrioventricular (AV)node.
B) sino atrial (SA)node.
C) atrium.
D) ventricle.

Question

Quizplus · Accepted Answer

The cluster of cells commonly referred to as the "pacemaker" is known as the sino atrial (SA) node. The atrioventricular (AV) node is a separate cluster of cells that helps delay electrical impulses to allow for appropriate timing of heart contractions. The atrium and ventricle are both chambers of the heart and not specifically related to the pacemaker cells.

The Cluster of Cells Commonly Referred to as the "Pacemaker