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The correct answer is option 3: Arteries. Blood pressure is the force exerted by circulating blood on the walls of the arteries. Arteries are the blood vessels that carry oxygenated blood away from the heart to various parts of the body. As the heart pumps blood into the arteries, the blood pushes against the walls, creating pressure. This pressure is necessary for the blood to flow throughout the body and deliver oxygen and nutrients to the cells. Monitoring blood pressure is important as it can indicate the health of the cardiovascular system. High blood pressure (hypertension) can put strain on the arteries and increase the risk of heart disease, while low blood pressure (hypotension) can lead to dizziness and inadequate blood supply to organs.