Slow twitch muscle fibres rely on a rich supply of oxygenated blood as they use oxygen to produce energy for muscle contraction. (bbc.co.uk)
If a particular part of the brain is working more than another part, this causes a change in the amount of oxygenated blood flowing to that part of the brain. (caltech.edu)
In just the last decade, ocean researchers have seen evidence of methane being produced in oxygenated water, and dubbed the phenomenon the «methane paradox,» but no microorganism has been found to be responsible. (sciencedaily.com)