Heart Rate is Slowest If the Pacemaker Activity Signal Originates

Question

Heart rate is slowest if the pacemaker activity signal originates in the
A) SA node.
B) AV node.
C) normal pacemaker of the heart.
D) ventricular conducting cells.

Accepted Answer

The heart rate is slowest when the pacemaker activity originates in the ventricular conducting cells, as they have the slowest intrinsic firing rate compared to the SA node, AV node, and normal pacemaker of the heart.