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Human circulatory system is a double circulatory system (two times) because blood passes through the heart twice in a complete circuit. (for oxygenated blood and deoxygenated blood)

There are two types of circulatory system in human beings :

1.pulmonary circulatory- blood circulates from the heart to the lungs and back to the heart

2.systematic circulation- blood circulatea from the heart to other organs and back to the heart.

The human heart will undergo over 3 billion contraction cycles

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