Any beginning is amazing. But as for the respiratory tract, the first step is to find out where, in fact, they begin. If you say that in the mouth, you will not be alone in this opinion-so many answer, but this is a mistake. Although we often use the mouth for breathing, kissing, or Smoking, it is still anatomically related to the digestive tract and is microscopically closer to the intestines than to the bronchi: its main function is to eat, not to breathe. The airway begins with the nose, which shares many functional and anatomical features with the bronchi.…