In both the atria and ventricles,the first cells to depolarize are also the first cells to repolarize.

Name: In both the atria and ventricles,the first cells to depolarize are also the first cells to repolarize.
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The first cells to depolarize in the atria and ventricles are the pacemaker cells (SA node in atria and AV node in ventricles), but these cells do not immediately repolarize. The surrounding myocardial cells depolarize after the pacemaker cells and then repolarize before the pacemaker cells.

In Both the Atria and Ventricles,the First Cells to Depolarize