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Most of our inner organs are crisscrossed with micro-capillaries blood vessels ensuring oxygenation and supply of nutrients. However, with regards to our brain the situation is different. Although the brain gets lots of oxygen, it is all delivered blood vessels on the surface of the brain and no vessels are actually within the white and gray brain matter. In addition, this organ is surrounded by a barrier that ensures that blood does not enter the tissues. Thus, one has to ask, does the all the brain tissues get enough oxygen for oxygen to be the main electron donor, or does H2S act as the electron donor in part of the brain?
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