500
Name and label each part of the respiratory system starting with air entering. Be sure to know their functions for the test!
What is air enters through the nose or mouth. It passes through the larynx an into the trachea. From the trachea it enters the lungs through the bronchial tubes. In the bronchial tubes, oxygen passes through the walls of your air sacs into the blood cells. Carbon dioxide enters into the air sacs and travels back through the lungs, leaving the body.