In the heart cycle, the contract(s) and blood is pumped out of the heart.

Answer;

-Ventricles

In the heart cycle, the ventricles contract(s) and blood is pumped out of the heart.

Explanation;

-The cardiac cycle is the sequence of events that occurs when the heart beats. As the heart beats, it circulates blood through pulmonary and systemic circuits of the body.

-There are two phases of the cardiac cycle; diastole and systole. In the diastole phase, the heart ventricles are relaxed and the heart fills with blood. In the systole phase, the ventricles contract and pump blood out of the heart and to arteries.

the pic attached shows the stages of mitosis. hope it !

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