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As per the theory of yawning, when the person gets tired or bored, the amount of carbon di oxide in the body of person increases and oxygen level decreases. This leads to low blood flow to the heart and brain, so to increase the oxygen level the person yawns. In the process of yawning more amount of carbon di oxide goes out of the body and the body can take more amount of oxygen

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11y ago
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Q: Why does a person yawn when they are tired?
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