The amount of blood expelled by the heart into the arteries in one minute is called the cardiac output and is about 5 L/minute. Blood pressure is equal to the total vascular resistance multiplied by the cardiac output. Hypertension is the medical term for high blood pressure and has nothing to do with excessive nervous tension.
High blood pressure in individuals older than age 18 is defined as a systolic blood pressure of greater than 140 mmHg and/or a diastolic blood pressure of greater than 90 mmHg based on the average of two or more readings taken at each of two or more visits after an initial screening (average of at least four readings taken days or weeks apart).

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