1. blood pressure
Wikipedia definition
2. Blood pressureBlood pressure (BP) is the pressure exerted by circulating blood upon the walls of blood vessels, and is one of the principal vital signs. When used without further specification, "blood pressure" usually refers to the arterial pressure of the systemic circulation. During each heartbeat, blood pressure varies between a maximum and a minimum pressure. The blood pressure in the circulation is principally due to the pumping action of the heart.
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