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What is blood pressure? Blood pressure is the amount of force that your blood puts on your artery walls as it moves through your body. Arteries are blood vessels that carry blood from your heart to the rest of your body. When your heart beats, it pushes your blood through your arteries.
When your heart beats, it squeezes and pushes blood through your arteries to the rest of your body. This force creates pressure on those blood vessels, and that's your systolic blood pressure. A normal systolic pressure is below 120. A reading of 140 or more is high blood pressure (also called hypertension).