The main structures of the human circulatory system include the heart, arteries and veins. This system act to transport red blood cells.
The human circulatory system is a system used by the body to transport oxygen-rich red blood cells, which is required during cellular respiration.
The human circulatory system includes the heart and blood vessels (arteries and veins).
The hearth is responsible to pump red blood cells to all the body, while blood vessels transport these cells to all the body.
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