Explain why it is sufficient to replace the ventricles, but not the atria, in artificial heart transplantation.

Explain why it is sufficient to replace the ventricles, but not the atria, in artificial heart transplantation.
At rest, the cardiac output of athletes can be equal to that of nonathletes, but the heart rate of athletes is lower than that of nonathletes. At maximum exertion, the maximum heart rates of athletes and nonathletes can be equal, but the cardiac output of athletes is greater than that of nonathletes. Explain.

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