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The circulatory system is extremely long
Red blood cells must squeeze through blood vessels
Big bodies have slower heart rates
The heart needs no body
People have studied the circulatory system for thousands of years
People have studied the circulatory system for thousands of years
Red blood cells are special
The end of a relationship really can "break your heart"
The end of a relationship really can "break your heart"
Human blood comes in different colors — but not blue