What is the expected heart rate when a heart is removed from a living body?
A) 75 beats / minute
B) 100 beats / minute
C) 50 beats / minute
D) the heart would immediately stop beating

Question

Quizplus · Accepted Answer

The intrinsic rate of the sinoatrial (SA) node, which is the natural pacemaker of the heart, is around 100 beats per minute. When the heart is removed from the body, it is no longer influenced by the parasympathetic nervous system, which typically acts to slow the heart rate. Therefore, the heart can beat at its intrinsic rate of approximately 100 beats per minute until it runs out of energy.

What Is the Expected Heart Rate When a Heart Is