Pacemaker Cells Isolated from the SA Node Generate Action Potentials

Question

Pacemaker cells isolated from the SA node generate action potentials at ________ beats per minute.
A) 20-40
B) 40-60
C) 80-100
D) 100-140
E) 140-180

Accepted Answer

Pacemaker cells isolated from the SA node generate action potentials at a rate of 80-100 beats per minute. This is the normal resting heart rate in humans. Options A and B are too slow, while options D and E are too fast.