What type of vibration is the heartbeat free or forced?

Heartbeat – forced vibrations. They are caused by electrical impulses that go from the part of the brain responsible for the work of the cardiovascular system to the heart muscle.
The heart is an organ located inside the body, and this is a rather dense environment. In such an environment, free vibrations should decay very quickly. Plus – they could not be uniform, and would be chaotic – due to the fact that they would be caused by random external impulses.
The heart beats evenly, with the same amplitude and intervals between beats. Free vibrations of this nature can persist for a long time only in a vacuum. Conclusion – cardiac fluctuations are forced.