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Contraction of heart ventricles generates blood pressure. It is the hydrostatic pressure that blood exerts against he wall of a vessel. Rigid vessels maintain blood pressure; less rigid vessels deform and blood pressure is lost.
Taking blood pressure readings is quick and painless. Usually, the process involves using either a sphygmomanometer or blood pressure machine. Blood pressure is expressed in millimeters of mercury (mmHg) and recorded as two numbers -- systolic pressure over diastolic pressure. For example, the doctor or nurse might say 130 over 80 as a blood pressure reading. This is written as 130/80. While both numbers are important when taking blood pressure, the systolic blood pressure is especially important to be aware of as people grow older.