The reason your heart beats properly is due to a beautiful design and perfect timing. Imagine you could design a spark plug with a built in timer that emits an electrical spark at a set
rate. Let's say this plug's timer is set for one second. So every second, this spark plug will emit a spark unless another plug nearby does so first. If a neighboring
plug sparks first, the original spark plug will simply carry the electrical impulse to the next plug and restart it's own timer. We'll call the spark plug with the shortest timer, the
Now let's take those spark plugs and place them in the heart muscle so that the plugs at the bottom of the heart have a longer timer than the ones at the top. The "pacemaker" will be
positioned at the top of the heart. This means that, under normal operation, an electrical signal will travel every second from the top of the heart to the bottom and then reset so the
process can be repeated. This is the cycle the causes the muscle fibers of the heart to contract and pump blood through the organ in an organized and effective manner. This particular
scenario would cause a heart rate of 60 beats per minute.