Asked by MARIANNE

Why is blood pressure expressed with 2 numbers?

Answers

Answered by drwls
There is a maximum and a minimum pressure as the heart does its pumping. They are called the systolic and diastolic pressures. The higher systolic pressure occurs when the heart is contracting, and the lower pressure happens between "beats".

For an animation, see
http://www.youtube.com/watch?v=84PrHxJri9Q&feature=related
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