What are the reasons for the enormous capacity for work of the heart?

The heart is an amazing organ. It works throughout our life, providing the body with oxygen and nutrients that reach each cell through the arterial current, and removes food through the veins. As long as a person lives, his heart does not stop working.

But what’s the secret? And the secret is that the mode of work and rest at the heart alternates. They have their own cycle, according to which they work. The cycle time is 0.8 seconds.

First, the atria contract (atrial systole phase) – -0.1 seconds. In this case, the ventricles are in a relaxed state (diastole). Blood passes through the cusp valves and enters the ventricles.

The systole (contraction) phase of the ventricles lasts 0.3 seconds. The atria rest at this time.

This is followed by a general rest phase of 0.4 seconds.

Thus, the atria work for only 0.1 seconds and rest 0.7. The ventricles work 0.3 seconds and rest 0.5 seconds.