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Circulatory System
Composed of the heart, blood, and vascular system.
Heart
Made of cardiac muscles, involuntary, with numerous nuclei to support the energy needed to pump blood.
Atria
Two upper chambers of the heart.
Ventricles
Two lower chambers of the heart; the left ventricle is thicker than the right ventricle.
Interventricular Septum
Separates the two ventricles of the heart.