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A normal but poorly conditioned heart is relatively small and weak because, like any muscle that is not exercised properly, it wastes away somewhat. An enlarged unhealthy heart usually grows that way to compensate for some deficiency in the cardiovascular system - hypertension or some vascular deformity. Such enlarged hearts, however, are not as efficient as the hearts that grow large through training. Their interior volume, despite their exterior size, is not as large, so they can't pump as much blood with each stroke. Read more: http://healthmad.com/conditions-and-diseases/the-vital-functions-of-human-heart-and-its-tissue/#ixzz1juW4XM00