Blood Pressure:
The force of blood exerted on the inside walls of blood vessels. Blood pressure is expressed as a ratio (example: 120/80, read as "120 over 80"). The first number is the systolic (sis-tah-lik) pressure, or the pressure when the heart pushes blood out into the arteries. The second number is the diastolic (dy-uh-stah-lik) pressure, or the pressure when the heart rests.
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