Define blood pressure. How do you calculate it? What does systolic reading mean? What does dystolic reading mean?

When your doctor takes your blood pressure, it's expressed as a measurement with two numbers, with one number on top "systolic" and one on the bottom "diastolic", like a fraction. For example, 120/80 mm Hg. The top number refers to the amount of pressure in your arteries during the contraction of your heart muscle.

Explanation:

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