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why do we yawn ?

By  March 25, 2019  No comments
                                                      why do we yawn ?


yawn seems to be the way the body uses to bring more oxygen to the brains , when we yawn we inhale slowly and deeply, then we will expire, we yawn especially when we are tired or bored. refreshing your face can help stop yawning it is impossible to hold back a yawn and the animals are yawning too





*learn more:

  • babies' lungs are pink. it darkens as we get older because the air we breathe is dirty
  • In the rest we inhale and exhale about 500 cm3 of air 13 times per minute. 
  • the lungs of an adult man have an average capacity of 6 liters
  • those of a woman 4.5 liters
  • in ancient times people believed that the soul and the breath were the same thing

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