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You know me very well. You depend on me day and night. I never get to rest. Sometimes I feel you’re abusing me. Occasionally I cause you a great deal of grief.
Hello, I am your heart.
Although I weigh less than a pound, I am capable of prodigious amounts of work. While you’re relaxed, I pump about 6 quarts of blood every minute. But when you are exerting yourself to the maximum, my workload increases 3 to 6-fold.