BSIP, B. BOISSONNET / SCIENCE PHOTO LIBRARY BSIP, B. BOISSONNET / SCIENCE PHOTO LIBRARY
High blood pressure. Man measuring his blood pressure using a digital sphygmomanometer. The reading shows that the man has hypertension (high blood pressure). A normal blood pressure reading would have the top value at less than 120 and the bottom value at less than 80.
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