Normal resting heart rate is around 70 beats per minute due to the SA node. If the SA node fails, what would you expect the heart beats per minute to be?
A) 10 -20 beats per minute
B) 50 beats per minute
C) 70 beats per minute as the AV node takes over for the SA node
D) If the SA node fails the individual will go into heart failure and therefore there will be no heart rate.
E) 30 -40 beats per minute

Question

Quizplus · Accepted Answer

EIf the SA node fails, the AV node or other pacemaker cells lower in the conduction system can take over pacing the heart, but at a slower rate. The AV node typically paces the heart at around 40-60 beats per minute, which is why option B is correct. Additionally, other pacemaker cells can set a rate around 30-40 beats per minute, making option E also correct.

Normal Resting Heart Rate Is Around 70 Beats Per Minute