Question

What is blood pressure BP ?

Answer 1

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Blood pressure is the pressure of circulating blood on the walls of blood vessels. Used without further specification, "blood pressure" usually refers to the pressure in large arteries of the systemic circulation. 

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Answer 2

the pressure that is exerted on the walls of blood vessels per unit area by the blood is called blood pressure
normal blood pressure is 120÷80 , 120 is systolic blood pressure while 80 is diastolic blood pressure
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