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Homework Help: Find how many times blood is filtered in the kidney?

  1. Feb 3, 2016 #1
    1. The problem statement, all variables and given/known data
    The blood that circulates in our body is about 1/12 of our mass. If the kidneys filter 7.5 liter of blood a hour, then how many times does it filter in the kidney the whole blood of a person will mass 60kg?
    2. Relevant equations
    1/12*60=5 liter blood

    3. The attempt at a solution
    Here's what my teacher did:
    1/12*60=5 liter blood
    0.55*5=2.75 liter plasma of blood.
    The plasma is filtered 60 times is 24 hours. (how did she find that?)
    24 hours ->60 times the plasma filters
    1 hour -> x
    x=2.5 times
    Do you understand her explanation? What should I do next?
  2. jcsd
  3. Feb 3, 2016 #2


    User Avatar

    Staff: Mentor

    Something is off here. I don't see how the plasma is related to the original question at all, as far as I can tell it is just about volumes of the blood. 7.5/5=1.5 times per hour.
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