This heart is just beating peacefully on its own outside the body, prior to a transplantation surgery!
That's a classic representation of cardiac automaticity, which is the property of a specialized cardiac cells called pacemakers to generate spontaneous electrical impulse.
The heart has its own pacemaker independent of the brain. As long as it has oxygen, it continues to beat. The heart could actually be removed from the body, placed in saline solution, given oxygen, and still continue to beat. This is why although the brain is dead, the heart continues to beat.
Cells capable of generating an impulse are in the sinus node and AV node, which fire at regular intervals and leads to the beat.
So as you might guess, the cardiac action potential and regulatory mechanisms lie within the heart itself and depends on these intrinsic nodes rather than the CNS.
Reposted from @medicaltalks
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