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Strongest

The heart weights about 11 ounces and is the size of a clenched fist. The heart of a man performs at about 60 to 80 beats a minute. In a year, it beats some 40million times. At each beat it takes in nearly a quarter of a pint of blood; in a single day it pumps 2,200 gallons of blood, and in the course of a single lifetime about 56million gallons. Is there any other engine capable of carrying such heavy work over such a long period of time without needing to be repaired?
Obviously the human heart is a small yet highly efficient piece of equipment.