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How Does Blood Circulate?

There are three major components to the circulation system: the heart, the arteries, and the veins.

The heart pumps oxygen and nutrient-rich blood through a network of arteries to every cell in the body. The veins return waste products generated by the body and deoxygenated blood back to the heart and lungs to be enriched with oxygen and nutrients before being pumped back to the body where the cycle continues.

The veins must overcome gravity to transport used blood back to the heart. The rhythmic contractions of the heart and movements of the chest and body's muscles eg. calf muscles contribute to transporting the blood back to the heart through the veins.