Abstract
Despite the advance in biochemistry, there are two substantial errors that have remained for at least two centuries. One is that oxygen from the atmosphere passes through the lungs and reaches the bloodstream, which distributes it throughout the body. Another major mistake is the belief that such oxygen is used by the cell to obtain energy, by combining it with glucose. Since the late nineteenth century, it began to be published that the gas exchange in the lungs cannot be explained by diffusion. Even Christian Bohr suggested that it looked like a cellular secretion. But despite experimental evidence to the contrary and based only on theoretical models, the dogma that our body takes the oxygen it contains inside from the air around it has been perpetuated to this day. The oxygen levels contained in the human body are high, close to 99%, and the atmosphere only contains between 19 and 21%. The hypothesis that there is a supposed oxygen concentrating mechanism has not been experimentally proven to date, after almost two centuries. The mistaken belief, even among neurologists, that our body takes oxygen from the atmosphere is widespread, even though there is no experimental basis to support it, just theoretical models. Our finding that the human body can take oxygen from the water it contains, not from the air around it, like plants, comes to mark a before and after in biology in general, and the CNS is no exception. Therefore, establishing the true origin of the oxygen present within our body and brain will allow us to better understand the physio pathogenesis of neurodegenerative diseases.