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Does the medulla monitor blood pH

  1. May 20, 2012 #1
    Does the medulla monitor blood pH or is it only the receptors in the heart (aorta / carotid bodies)?
     
  2. jcsd
  3. May 20, 2012 #2

    bobze

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    Is this a homework question?
     
  4. May 21, 2012 #3
    no its a me being confused question
    you see I have read several different books / sources and they each imply different things
    some books imply it only monitors tissue fluid pH (Cerebospinal fluid) some imply it just acts as a co-ordinator and some imply it monitors blood pH

    which one is correct ?
     
  5. May 21, 2012 #4

    bobze

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    It does so indirectly by monitoring CO2 levels. CO2 crosses the BBB freely, which is converted by carbonic anhydrase to H+. in the CSF.

    So if there is a rise in CO2 (think ultimately acid here), this will cause the central chemoreceptors to stimulate respiration: leading to you blowing off the acid and decreasing pH.
     
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