Title: Необов'язково

Text: For blood flow to occur between any two points in the circulatory system, there must be a difference in the energy level between these two points. Usually, the difference in energy level is reflected by a difference in blood pressure, and the circulatory system generally consists of a high-pressure, high-energy arterial reservoir and a venous pool of low pressure and energy. Кожен абзац буде тестом.

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