close
    1. Home
      2. ›
    2. Uncategorized
      3. ›
    3. Why do people yawn?
    Why do people yawn?

    Answer this
    +1  Views: 448 Answers: 3 Posted: 14 years ago
    Comment this question

      3 Answers

      Although scientists still cannot pinpoint the exact biological mechanisms of a yawn, they agree that it is an involuntary reflex that controls the oxygen and carbon dioxide levels in the blood.
      14 years ago. Rating: 4
      Comment this answer

        Because they're too tired or too bored...like me right now (yawwn :O)
        14 years ago. Rating: 3
        Comment this answer

          Yawning cools the brain and increases blood flow. Thus making it efficient.
          14 years ago. Rating: 2
          Comment this answer



            Did this answer your question? If not, then ask a new question.

            Top contributors in Uncategorized category

             
            ROMOS
            Answers: 18061 / Questions: 154
            Karma: 1102K
             
            Colleen
            Answers: 47269 / Questions: 115
            Karma: 953K
             
            country bumpkin
            Answers: 11322 / Questions: 160
            Karma: 838K
             
            Benthere
            Answers: 2392 / Questions: 30
            Karma: 760K
            > Top contributors chart

            Unanswered Questions

            411B Đ. Nam Hoà, Phước Long A, Thủ Đức, Thành phố Hồ Chí Minh, Việt Nam
            Answers: 0 Views: 0 Rating: 0
            88AA BEST
            Answers: 0 Views: 9 Rating: 0
            nohu3968com
            Answers: 0 Views: 11 Rating: 0
            nohu3968com
            Answers: 0 Views: 11 Rating: 0
            51XBET
            Answers: 0 Views: 8 Rating: 0
            s8truyencom
            Answers: 0 Views: 9 Rating: 0
            ta88fans
            Answers: 0 Views: 8 Rating: 0
            nowgoallio
            Answers: 0 Views: 7 Rating: 0
            > More questions...
            528702
            questions
            766080
            answers
            876620
            users