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The second number, called diastolic blood pressure, measures the pressure in your arteries when your heart rests between beats. The first number, called systolic blood pressure, measures the pressure in your arteries when your heart beats. What do blood pressure numbers mean?īlood pressure is measured using two numbers: Your blood pressure normally rises and falls throughout the day. Arteries carry blood from your heart to other parts of your body. Blood pressure is the pressure of blood pushing against the walls of your arteries.
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