Better yet, how about I actually highlight your errors, rather than respond to your attempt to pretend that you actually interpreted the discourse correctly the first time....
it's worth noting that the idea that we suffocate in an environment or an atmosphere without co2 is wrong -- we do not suffocate, we do breathe, even el 100% oxygen, because the body is producing co2 as you breathe so there's always enough co2 to in the lungs to trigger your respiration reflex.
Please note, if you will, that
you highlighted the correct part of the original post that I was responding to. However, you then completely misinterpreted it to mean something entirely differnet....
You appear to conclude that he, and presumedly I, were talking about replacing 100% of CO2 with oxygen in the atmostphere. That wouldn't be dangerous at all. Duh. No one was talking about replacing less than a percentage point of anything with anything else. And then you folow up with this...
100% Oxygen however, is lethal, not because we'd fail to breathe, but because the oxygen itself would kill us.
Which was almost exactly my argument. So what do you do?
Sure. Care to point out where in this:
Quote from: MoonShadow on Today at 07:15:04 PM
http://en.wikipedia.org/wiki/Oxygen_toxicityYou found this?
CO2 is used by the body to determine when to actually cycle breath, but the presence of pure oxygen in the lungs, and the lack of CO2 of some small percentage, tricks the system into waiting to breath until the CO2 that is coming back from the bloodstream is high enough to trigger a breath. The problem is that the detection of CO2 is delayed for many reasons, so while the lungs aren't really running low on oxygen, the stagnation of the oxygen in the lungs, combined with it's elevated concentration in the bloodstream, contributes to oxygen toxicity syndrome.
'cause I don't see it. I do see a lot of pulmonary effects, most notably irritation, but I also see references to "48 hours on pure oxygen..." Is that on sleep deprivation, as well?
The reason that you "don't see it" is because that link was just a reference for oxygen toxicity syndrome, but it even does have a loose reference in there that you filtered out with your cognative disonance...
http://en.wikipedia.org/wiki/Oxygen_toxicity#Pulmonary_toxicityThe lungs, as well as the remainder of the respiratory tract, are exposed to the highest concentration of oxygen in the human body and are therefore the first organs to show toxicity. Pulmonary toxicity occurs with exposure to concentrations of oxygen greater than 0.5 bar (50 kPa), corresponding to an oxygen fraction of 50% at normal atmospheric pressure. Signs of pulmonary toxicity begins with evidence of tracheobronchitis, or inflammation of the upper airways, after an asymptomatic period between 4 and 22 hours at greater than 95% oxygen,[34] with some studies suggesting symptoms usually begin after approximately 14 hours at this level of oxygen"
http://en.wikipedia.org/wiki/Oxygen_toxicity#MechanismThe biochemical basis for the toxicity of oxygen is the partial reduction of oxygen by one or two electrons to form reactive oxygen species,[49] which are natural by-products of the normal metabolism of oxygen and have important roles in cell signalling.[50] One species produced by the body, the superoxide anion (O2–),[51] is possibly involved in iron acquisition.[52] Higher than normal concentrations of oxygen lead to increased levels of reactive oxygen species.[53] Oxygen is necessary for cell metabolism, and the blood supplies it to all parts of the body. When oxygen is breathed at high partial pressures, a hyperoxic condition will rapidly spread, with the most vascularised tissues being most vulnerable. During times of environmental stress, levels of reactive oxygen species can increase dramatically, which can damage cell structures and produce oxidative stress
As noted elsewhere, CO2 is used as a method to detect when the body needs to breath, but the system has delays; thus a pure oxygen environment leads to slower breathing cycles than even a 99.6% oxygen to 0.4% CO2 ratio would, permitting more time for oxygen to proceed through the reduction process before being expleled and replaced with fresh oxygen. This doesn't prevent toxicity, but does delay it as more of the oxygen ions are expelled with the rest of the breath.
http://yourlogicalfallacyis.com/tu-quoque