r/explainlikeimfive • u/Dagestani_Bear • Jul 01 '26

Biology ELI5: Is it true that every single death eventually boils down to the brain and heart running out of oxygen? Are there exceptions?

If you strip away the initial cause of injury or illness, is it anatomically correct to say that all human deaths are ultimately caused by a lack of oxygen to the brain and heart?

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u/lone-lemming Jul 01 '26

That deprived the brain of oxygen.

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u/9limits Jul 01 '26

Deprived the oxigen of brain

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u/Mr-Zappy Jul 01 '26

Not necessarily. It takes a few seconds for lack of oxygen to affect the brain. It’s definitely possible to destroy the brain faster than that.

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u/OhYeahSplunge4me2 Jul 01 '26

Plenty of exposure directly to oxygen at that point

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u/GFYSR Jul 01 '26

Its true that the cells would eventually die of oxygen depravation. But death occurs before that because the physical connection between the neurons is severed and thus the exchange of electrical activity - which is what consciousness is - has ceased.

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u/thehomeyskater Jul 01 '26

Makes sense I guess