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Is it true that we yawn when our brains are deprived of oxygen? Most of us can feel a yawn coming on. The muscles in our jaw begin to tighten, our nostrils might flare, and our eyes might tear up ...

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Yawning, a universal reflex, is characterized by a deep inhalation and short exhalation. While often linked to tiredness, its exact cause remains a mystery. Though oxygen deficiency is a common ...

Is it true that we yawn when our brains are deprived of oxygen?

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