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RESOURCES
This article on the Scientific American website talks about the diving reflex in both water mammals and humans. The site explains what happens when the diving reflex is activated and the body's systems change/slow down.
This SciShow video talks about how marine mammals are able to dive for long periods of time. It talks about myoglobin and how this works in marine mammals. The video also briefly talks about the other traits for holding breath for long periods of time.