A single heart cell has its own beating heart
or at least its own rhythm..
As I understand it: each heart cell has its own beat, when it stands alone.
It may be that each heart cell's rhythm is as unique as a snowflake or
human fingerprint. I have been quite taken by them, since I first saw
one beating. Uniqueness flourishes down to the smallest particle, I'm
sure, even if it can't yet be measured.
So... (correct me if I am wrong) As a part of a working heart, this
multitude of cells synchronize their rhythm with all the others, to
create one heartbeat. Our heartbeat is really made up of a zillion tiny
heartbeats. They synchronize like an orchestra would, and beat as one.
Astounding teamwork. 
There may be rogue cells, of course, trouble makers. Don't want
to conform... would rather kill the host.
Ooh here's a video:
&feature=related
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...why the heartbreak of psoriasis hurts so much! 
"There may be rogue cells, of course, trouble makers. Don't want
to conform... "
They're called "drummers" 
