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Biology, 03.08.2019 15:30 noobnoobnoobnoob666
Blood pressure peaks when the heart contracts, pumping blood into the arteries and causing them to stretch - this is called the pressure. blood pressure is at its lowest when the heart relaxes, called the pressure. a "normal" blood pressure for a young adult is said to be 120/80, and these numbers represent these two different pressures.
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