Fluids in the Human Body

  1. I recently learned about the pressure of the atmosphere against the human body. It just so happens that this force is in equilibrium with the human body, so we do not feel any pressure. Although if we fly an airplane, we do.

    This got me to thinking, what of the blood in our veins? Does this not exert a force outward, which I can only assume is in equilibrium with a force acting against it. So now, I have the pressure of the atmosphere acting on me, as well as a pressure from my blood acting in another direction. Is this correct? Are there any other fluids in the human body (mucus?) that I am neglecting?
     
  2. jcsd
  3. Andy Resnick

    Andy Resnick 5,943
    Science Advisor
    Education Advisor

    It sounds like you are neglecting Newton's third law.

    There are lots of fluids within the human body besides blood, bile, and chyme. Too many to list.
     
  4. boneh3ad

    boneh3ad 1,761
    Science Advisor
    Gold Member

    And of course there is the most important fluid in the body: water.
     
  5. Don't leave me hanging!
     
  6. Ok:

    So if the atmosphere exerts a force on the human body, then an equal force will be exerted from the human body. Is this correct?

    If my thinking is correct, why do increased pressures cause us pain or make our ears pop? Does it hurt our bodies to exert a greater force then what we are used to? If we go really deep into the ocean, there must be a point where the pressure overwhelms our body, and we get crushed.
     
  7. I'd say everyone forgot to mention Lymph, which is a major toxin removal system. It is distinguished from the circulatory system by lack of a pump such as a heart.
     
  8. dont forget the gas pressure, thats way more than the pressure in your veins, which is pretty much nothing.
     
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