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Conduction System of the Heart
...  atria of the heart contracts at the same time; and when they start to relax, the ventricles start contracting. This contraction phase is known as the systole, and the relaxation phase is called the diastole. The heart is responsible for pumping blood to the lungs and the rest of the body. The distribution of blood through pulmonary circulation and systemic circulation is accomplished by the  ...

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