The muscle of heart is involuntary and beats continuously. The heart muscle relaxes between each heartbeat. The condition is diastole in which the heart relaxes, after contraction, so the chambers can fill with blood again.
What are involuntary muscles?
The muscles that are not in control of person. It actually works automatically.
It can be locomotory muscle, middle ear muscle, cardiac muscle, etc.
There is a sequence of systole and diastole in heart, systole is the contraction of heart and diastole is the relaxing point of heart between each heartbeat.
Thus, the heart muscle relaxes between each heartbeat.
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