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What happens here is that your cells run out of oxygen, you run out of energy, and your muscles feel sore due to the lactic acid dumped into the muscle tissues by your cells. What the body's cells are pretty convincingly trying to tell you here is- stop exercising or we will die.
Under relatively normal circumstances, we start struggling after a few minutes without oxygen. Without being able to convert energy and use it up, cells start to die. This happens throughout the entire body, but it is the brainâs lack of oxygen that is most urgent. âThe brain is a highly metabolically active organ,â Tishler said. âIt needs oxygen to generate the energy to function. Without the energy (without oxygen) it dies.â The brain normally takes up about 20 percent of the bodyâs oxygen. If it doesnât get what it needs, cells begin dying off, putting a person at risk of permanent brain damage. If a person suffocates, or suffers another type of involuntary oxygen deprivation, theyâll ultimately suffer brain death: the utter, irreversible loss of brain function. Itâs a pretty unavoidable succession of events.