When a chamber fills with blood, we refer to that as diastole. When the chamber ejects blood, we refer to it as systole. This orchestrated series of events occurs synchronously due to microscopic electrical channels, known as “the conduction system” of the heart.

 

All of this combines into maintaining our blood pressure, which changes with exercise, and can be monitored on ECG and pressure tracings, as shown in the video below.

 

Even with modern scientific advances, such as the implantable ventricular assist devices, no technology has yet to be developed that is as magnificent as the original design and function of our hearts!