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We know that atmospheric pressure is 760mmHg, whereas blood pressure in blood vessels is somewhere between 80 to 120 mmHg. As outer pressure is higher than inner so shouldn't it cut off the blood flow?

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    $\begingroup$ Those pressure values for blood vessels are so-called gauge pressures (i.e., relative to atmospheric). Gauge pressure is absolute pressure minus atmospheric pressure. So the absolute pressures in the blood vessels actually do exceed atmospheric pressure. $\endgroup$
    – Chet Miller
    Commented Jul 17, 2016 at 2:30
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    $\begingroup$ I am sure that the blood pressure value is the excess pressure not the total pressure. $\endgroup$
    – Lewis Miller
    Commented Jul 17, 2016 at 2:31
  • $\begingroup$ @ChesterMiller I think your comment qualifies as an answer $\endgroup$
    – Anthony X
    Commented Jul 17, 2016 at 2:44
  • $\begingroup$ A sphygmomanometer measures the blood pressure gauge. $\endgroup$
    – Sikander
    Commented Jul 17, 2016 at 5:39

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