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Every cell in the body requires a steady supply of blood carrying oxygen and essential nutrients to function, grow, and repair. The heart pumps blood through the circulatory system, a network of blood vessels called arteries. Blood pressure is the force of the blood pushing against the walls of the arteries as the heart pumps it around the body. Blood pressure rises and falls with each heartbeat and can be affected by factors such as age, weight, fitness level, stress, and the health of the blood vessels themselves.