Ask a Teacher

Search



Is yawning a part of respiration ?
  No, it is not a part of respiration. According to theory, when people are bored or tired, they breathe more slowly. As breathing slows down, less oxygen makes it to the lungs. As carbon dioxide builds up in the blood, a message to the brain results in signals back to the lungs saying, "Take a deep breath," and a yawn is produced. The physiological norm for breathing at rest (for adults) is only 6 L/min.


comments powered by Disqus