quick question... for all you bio nerds

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DrReo

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    To put more blood in your internal and external anal sphincter doesn't slam shut. Note, this is why your bowls are tappered
     
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    Mazmel

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      in EMT school they taught us that the vagus nerve is pushed on when you take a dump. that is why some old people are scared to go to the bathroom without someone around- in case they die on the toilet. EMTs often find dead old people on the toilet. true stuff!
       

      dentstd

      Fena Gonzales
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        On the serious NOTE



        why is it that when you take a big dump you get light headed?




        Serious NOTE

        Um, what? I never get light-headed taking a dump. But I guess it's possible you crap bigger turds than normal.

        Or because the body shunts blood from the systemic to the GI system. That shunt may, in the short term, consequently decrease intracranial blood pressure, making you feel light-headed.
         

        dentstd

        Fena Gonzales
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          Vagus response. You Push Push Push on your vagus nerve then you get up and it causes a severe case of orthostatic hypotension.


          I dont know, educated guess, I guess..?

          I seriously doubt it's the vagus, because the anal sphincter's under somatic control (and for a good reason!).
           

          DrSphinx

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            I seriously doubt it's the vagus, because the anal sphincter's under somatic control (and for a good reason!).

            This is actually only half true. The internal anal sphincter is entirely involuntary in nature, the external anal sphincter is voluntary.

            Not really sure about the vagus but it is a justifiable answer since it does innervate parts of the large intestine.

            yay anatomy and gastrointestinal physiology courses...college at its finest!
             

            Quattro DMD

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              To the OP, you may be getting light headed if you're relying too much on the Valsalva maneuver. You may want to increase the amount of fiber in your diet. I suggest a half cup of Quaker old fashion oats per day. If you are really clogged I would also recommend a Monster engergy drink with 1-2oz of almonds.
               

              mena22787

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                Maybe you're trying so hard with your abdominal press that you just forget to breath?

                i believe it also has something to do with breathing--i think that when you have a bowel movement, your vocal cord thingamajig closes to increase abdominal pressure and therefore help push the feces out of the rectum. thus, a lack of breathing may cause the dizziness experienced...
                 
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