MIT researchers believe that blood may actually play a role in neural activitiy:
“We hypothesize that blood actively modulates how neurons process information,” Christopher Moore, a principal investigator in the McGovern Institute for Brain Research at MIT, explained in an invited review in the October issue of the Journal of Neurophysiology. “Many lines of evidence suggest that blood does something more interesting than just delivering supplies. If it does modulate how neurons relay signals, that changes how we think the brain works.” [via MIT News]
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