why circulation through human heart is also known as dual or double
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It is called a double circulatory system because blood passes through the heart twice per circuit. The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart. ... By the time this blood returns to the heart, it has returned to a deoxygenated state.
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it is called so because the right aide of heart passes deoxygenated blood which goes.to lungs and become oxygenated and return to heart while coming it becomes deoxygenated and this continues happen
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