The left and right ventricles, which when they contract pump blood into the systemic and pulmonary curcuits.
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It needs to have the same structures as the physical heart: valves, chambers, activation potentials, etc, and be able to pump blood.
Blood moves to the right ventricle where it is pumped to the lungs.
The muscle tissue on one side contracts while the other relaxes, controlled by electrical impulses to the heart muscle.
If you mean what percentage of you blood does your heart pump... all of it.
Congestive heart failure is the condition of a weakened heart not able to pump blood effectively.Congestive heart failure.