The article discusses the concepts of energy, sources, metabolic pathways to get it and possibilities to be used by cell. The oxygen need for human body, the physical basis of its diffusion into cells, and the limitation stemming from them are discussed. The main reasons that have played a significant role in a number of serving systems for cell metabolism appearance in high organisms during the evolution, and the leading role of the cardiovascular system in their interactions are analyzed.

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Автор(ы): A. I. Kubarko