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If you observe people, who are in the stage of confusion and panic (e.g., in horror movies), you may realize that their breathing is erratic, deep, and through the mouth. Breathing controls blood supply, oxygenation, and excitability of the brain. When a person breathe more that the physiological norm for breathing at rest (which is tiny 6 liters of air for one minute), the person will not get any more oxygen in the arterial blood. The arterial blood is up to about 98% saturated with oxygen during miniscule normal breathing...