Too much oxygen can harm the brain.
May 22, 2007 10:59am CST
Accordinding to a study researchers scanned the brains of 14 healthy children, ages 6 - 15, as they inhaled 100 percent oxygen through a mouthpice, and monitored their breathing and heart rates. After waiting eight minutes for the youngsters' breathing to return to normal, the team added 5 percent carbon dioxide to the gas mixture and repeated the scan. A comparison of the two scans revealed dramatic differences. "When the children inhaled pure oxygen, their breathing quickened, resulting in the rapid exhalation of carbon dioxide from their bodies. The drop in arbon dioxide narrowed their blood vessels, preventing oxygen from reaching tissue in the brain and hearth," said one of the researchers in neurobiology. That's when something surprising hapened on a MRI scan. Three brain structures suddenly lit up; the hippocampus, which helps contrl bllod pressure; the cingulate cortex, which regulates pain percention and blood pressure; and the insula, which monitords physical and emotional stress.
17 Jun 07
we all know that we are not breathing pure oxygen directly from the air. we only desire to breathe clean air rather than pure oxygen. this means that man's body was designed to cope with natural air and not pure oxygen. doctors and scientists have known about this before. that study must have been conducted to determine whether it will be fine for man to breathe pure oxygen as against what we normally do. the study results might be important as regards the need to devise the certain best type of air for humans to be breathing when the global warming thing reaches levels wherein people will need to breathe air from tanks rather than straight from the open air as we do now. this is no joke considering that people used to laugh at the idea of drinking water coming in bottles and paying for them too, in such packaging.