Which analogy fits the human heart?
A. It is like four pumps working in alternating cycles.
B. It is like a single pump whose various chambers all work together at once.
C. It is like a double pump, each working side by side with the other.
D. It is like a single pump.
E. It is like a double pump, each working at its own rate determined by the needs of the body served.
Answer: C
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