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*** Blood pressure is the force blood exerts against blood vessel walls. It can be measured using an inflatable rubber cuff, which is wrapped around the upper arm and connected to an apparatus that records pressure. Two readings are obtained. For example: 120/80. The first number is called systolic blood pressure because it indicates blood pressure during the heartbeat (systole), and the second number is called diastolic blood pressure because it indicates blood pressure while the heart is relaxed (diastole). Blood pressure is measured in millimeters of mercury, and physicians classify patients as hypertensive when their blood pressure is above 140/90.
**What makes blood pressure increase? Imagine that you are watering your garden. By opening the faucet or by reducing the caliber, or diameter, of the jet of water, you increase the pressure of the water. The same occurs with blood pressure: Increasing the rate of flow of blood or decreasing the caliber of the blood vessel elevates the blood pressure. How does high blood pressure occur? Many factors are involved.