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together with respiratory Blood pressure ( BP ) is the pressure of circulating blood against the walls of blood vessels . Most of this pressure results from the heart pumping blood through the circulatory system . When used without qualification, the term "blood pressure" refers to the pressure in the large arteries . Blood pressure is usually expressed in terms of the systolic pressure (maximum pressure during one heartbeat) over diastolic pressure (minimum pressure between two heartbeats) in the cardiac cycle . It is measured in millimeters of mercury ( mmHg ) above the surrounding atmospheric pressure . Blood pressure , heart rate , oxygen saturation , and body temperature —that healthcare professionals use in evaluating a patient's health . Normal resting blood pressure, in an adult is approximately 120 millimetres of...