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Why we yawn when we are …

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Why we yawn when we are sleepy or drowsy

    • Posted by Yuvraj Singh Shekhawat 6 years ago

    CBSE > Class 07 > Science
    • 2 answers

    Naman Ahden 6 years ago

    when we yawn or feels sleepy, there is not enough oxygen in the lungs, so, whenever we yawn, oxygen is pumped into our lungs, thus there is sufficient amount of oxygen for breathing

    0Thank You

    Renuka Seiwal 6 years ago

    When we are sleepy, we breath slowly,so we get less Oxygen.To get sufficient oxygen we yawn

    0Thank You

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