breathing oxygen = more divetime?

when you breathe in the air regularly, not like 70 percent of nitrogen and the rest is oxygen and other things? When apnea, just a breath of air and oxygen have, the longer you can stay under the right? so if you breathe a breath of fresh air pure and keep it, would it be able to stay underwater for longer? If not, explain. Also, what is the actual composition of air? I do not know exactly. One more thing, I've never heard of being done, and I'm sure has been thought and done before, so what is wrong with the theory, or perhaps just I am ignorant of the normal procedures for diving (which is very possible). A detailed response would be appreciated, but not ridiculously scientific and complicated, I'm not too intelligent. give me a good response and you get 10 points and fat.

His desire to breathe is not dictated by the amount of oxygen in your system, but it is the excess CO2 causing the need to breathe. No matter what combination you breathe, you're still going to hit that magic number of CO2 in your bloodstream make your eyes bug out and makes you want to head to the surface, whatever the actual content of O2 in the blood. It really is an urban myth that hyperventilation before you dive, you can stay under longer. If anything can be dangerous and cause what is known as the shallow water black. The increase in soak time is reduced to free all his physical, mental state and degree of efficiency a swimmer you are. Nothing more. The composition of normal air is 21% O2, a little over 78% nitrogen and a little less than 1% other trace gases. Actually there is, in the technical aspects of diving, a time when even 21% of O2 in a tank is bad and they really want is less oxygen in the mixture. Diving to depths of 300 feet or less, requires the use of a hypoxic gas mixture. That is actually a mixture O2 has less than normal, even as low as 6% and a higher percentage of an inert gas such as helium. If you used 21% O2 at a depth as 300, you will suffer what O2 tox is called a coup. Will kill you die in an instant. A breath. Your central nervous system either fried or drowning or seizures, you and all the above. Gases behave differently under the pressure of what one would normally think. Especially in the human body.

Forschungstauchen (scientific diving) Uni Oldenburg – Germany

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