I’ve always wondered this since I was a child, and I see people use bags to rebreathe the air they have in their lungs for panic attacks, which only increases my curiosity.
In: Biology
You need oxygen, which you breathe in, but you breathe out carbon dioxide. If you rebreathe the same air, you’re decreasing the oxygen content with each breath. You’d suffocate yourself.
In a panic attack, the heavy breathing makes you hyperventilate. You get lightheaded from too much oxygen. By breathing into a bag, you’re not getting so much oxygen that you get lightheaded.
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