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circulatory system question

Discussion in 'MCAT Discussions' started by Simran1031, Dec 26, 2008.

  1. Simran1031

    Simran1031 Princess of 2014=)
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    I noticed that on the aamc study guide for bio it says regulation of plasma volume under composition of blood. I am not sure what this refers to..I tried to check for this in EK bio book and I wasnt sure. It sounds to me like how does blood make sure the volume is regulated and I am not sure what the answer is..any advice/info would be helpful!
     
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  3. swamprat

    Physician Classifieds Approved 10+ Year Member

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    I'm thinking kidneys, ADH, aldosterone etc.
     
  4. Nasem

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    Ok, This is totally related to this thread, is that avatar a picture of you? Cause your beautiful :D
     
  5. Simran1031

    Simran1031 Princess of 2014=)
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    yes that is me but an answer to the post would be greatly appreciated! =)
     
  6. Ibn Rushd

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    Let's break it down. What is plasma? What is plasma volume?

    Plasma is defined as the liquid portion of blood. It's the portion in which blood cells are suspended and other substances (proteins, sugars, ions, hormones, CO2, etc) are dissolved. Plasma volume is the amount of plasma, and it's important to know that it can vary. It can be increased or decreased. The activity of certain hormones induce such increases/decreases in plasma volume. Take ADH for example. ADH increases the amount of water reabsorbed at the collecting duct of nephrons. More water in the blood means a relatively greater plasma volume. Similarly, aldosterone, a steroid hormone, functions by increasing sodium absorbtion and potassium secretion in the kidney, this too leads to an increase in plasma volume (osmosis).
     
    #5 Ibn Rushd, Dec 26, 2008
    Last edited: Dec 27, 2008
  7. Simran1031

    Simran1031 Princess of 2014=)
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    thanks. that def. helps!
     
  8. Simran1031

    Simran1031 Princess of 2014=)
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    thanks. that def. helps!
     

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