and intertitles to illustrate human anatomy and physiology. Beginning with the organs of respiration, it highlights the structure and function of the nose, larynx, trachea, bronchi, and lungs ...

For example, breathing requires airflow between the nose or mouth and trachea. On the other hand, the lungs must be protected from aspiration during swallowing or vomiting by closing the ...

The air that enters the nasal cavity flows down the trachea ... to each lung. The bronchi in the lungs split into smaller and smaller tubes called bronchioles. These end in microscopic air ...