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Pressure in heart

  1. May 10, 2015 #1
    A man is standing up in aircraft that has a constant accerelation upward. Find the maximum accerelation that heart can't pump blood to brain. Head is 50cm above the heart. Pheart=100mmHg
    ΣF=ma
    Fn-mg=ma
    Fn=m(g+a)=ρ(blood)V(g+a)
    Pfoot=ρ(blood)H(g+a)
    Pheart=Pfoot-ρ(blood)(H-0.5)(g+a)
    I don't know in this situation Pheart=100mmHg or not
     
  2. jcsd
  3. May 11, 2015 #2

    CWatters

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    It's a lot simpler than you think.

    The hard way to solve this is to expand (2) and substitute (1) into (2) to eliminate Pfoot and H.

    Try it and the answer might suggest an easier way.
     
  4. May 11, 2015 #3

    CWatters

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    Yes. That's the pressure the heart can create.
     
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