Why deep-diving mammals don’t black out

//i.livescience.com/images/ig26_humpback_whale_02.jpg
From http://i.livescience.com/images/ig26_humpback_whale_02.jpg

A 2007 study shows that brain respiratory proteins called neuroglobin and cytoglobin may play a large role in the ability of diving mammals to supply more oxygen to the brain during long dives. Read more here.

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