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Hypercapnea in the brain?

  1. Feb 18, 2010 #1
    Hello guys,

    when blood vessels going to brain are constricted, there is less blood flow and less 02 and CO2 entering the blood vessels in the brain. How does this create hypercapnea (too much CO2), is all the 02 that comes in extracted and turned to carbon dioxide which causes this. Also this hypercapnea then develops everywhere. Why is that? Thanks a lot :smile:
     
  2. jcsd
  3. Feb 22, 2010 #2
    I think that the CO2 already present in the brain when the vessels are constricted cannot be released so the pressure and concentration of CO2 builds in the brain because of this. I am assuming that the brain cannot send signals to the heart to keep te blood flowing well in the body so the exchange of C02 and O2 cannot occur sufficiently in the lungs so CO2 builds all around the body cus it cant be released thru the lungs.

    Hope this helps:)
     
  4. Feb 22, 2010 #3
    there are at least two reflexes i am aware of. one is barometric and causes a constriction of blood vessels going to the brain when blood pressure in those arteries gets too high. the other reflex monitors blood CO2 indirectly by observing blood acidity. when acidity goes up, the artery relaxes and allows more blood to flow to the brain. the first reflex protects the brain from overpressure and stroke, while the second protects the brain from hypoxia.
     
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