Blood pressure is the pressure applied on the arteries and veins during the circulation. The instrument used is called a sphygmomanometer and two variables are measured as follows

1. Systolic pressure, which occurs during heart muscle contraction which forces blood into arteries, averages around 120 mmHg and is expressed in millimeters of mercury ).

2. Diastolic pressure, which occurs during relaxation of the heart muscle, averages around

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