Question

Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in anyway? [NCERT Exemplar; HOTS]

Answer 1

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● When we are sleepy or feel drowsy, we yawn because our brain cells lack sufficient amount of oxygen. The deep breath associated with yawning helps us to drawn in more oxygen and supply the much needed oxygen to the tired body organs including the brain..