# Bernoulli's Effect on Blood Pressure [closed]

What is the impact of height, let's say being on top of a 4,000 m high mountain, on blood pressure / flow velocity given Bernoulli's Equation?

## closed as unclear what you're asking by John Rennie, alephzero, sammy gerbil, ZeroTheHero, Jon CusterSep 27 '18 at 17:38

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• Why should Bernoulli's Equation be involved? One would think that Poiseuille's Law would be more applicable. – probably_someone Sep 26 '18 at 16:56
• This probably has as much to do with physiology as with physics. – V.F. Sep 26 '18 at 17:26
• Blood pressure is regulated by many factors, such as metabolic rate, stress levels (via adrenalin production,) diet (e.g. drinking alcohol lowers blood pressure), etc, etc. Some of those factors may change with altitude, but they are outside the scope of Bernoulli's equation! – alephzero Sep 26 '18 at 20:22

I think you are referring the to gz term in the Bernoulli equation. You are wondering what effect this term has if the datum for z is at (say) sea level, and the flow system (in this case, a person's blood system) is located at 4000 ft. Well, it is important to notice that there are two gz terms in the Bernoulli equation, namely $$gz_1$$ and $$gz_2$$. It is the difference between these two terms that is related to the pressure variation in the flow system, not just either one of them. In other words, it is differences in elevation that are important in the Bernoulli equation, not the absolute magnitude of any one elevation.