Which of the Following Best Describes a Pacemaker Cell

Question

Which of the following best describes a pacemaker cell?
A) Restricted to the SA node
B) Spontaneous depolarization
C) Incapable of repolarization
D) Stable resting membrane potential

Accepted Answer

Pacemaker cells are specialized cells found in the sinoatrial (SA) node and the atrioventricular (AV) node of the heart that generate spontaneous depolarizations, which initiate the electrical impulses that control heart rate and rhythm. They are capable of repolarization and have an unstable resting membrane potential, which allows for their spontaneous depolarization.