The principle that "the movement of the blood is maintained by the heart which acts as a pump" continues to be binding in modern physiology (Evans, 1952). Certain doubts, however, appear when the power of the heart muscle is regarded as the exclusive or even the main source of energy for the whole cardiovascular system. The question may be asked. Is there no other motive force in the circulatory system, besides the heart muscle that might be significant?
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Leon Manteuffel-Szoege:
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