The force which the blood exerts on the walls of the blood vessels is called blood pressure. As the heart beats, it pumps blood through a system of blood vessels, which carry blood to every part of the body. Diastolic pressure is the pressure that is exerted on the walls of the various arteries around the body in between heart beats when the heart is relaxed. Systolic pressure measures the amount of pressure that blood exerts on arteries and vessels while the heart is beating.
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