The respiratory system You are going to use models, charts, a short video and page 26 of the student book to learn about the respiratory system. Use the following words to label the diagram below. air sac bronchiole bronchus         diaphragm          intercostal muscles    lung pleural membrane rib                     trachea                List the parts of the respiratory system that: a molecule of oxygen passes through before entering the blood, starting with the trachea Trachea à _____________________________________________________________ a molecule of carbon dioxide passes through after leaving the blood, starting with an air sac Air sac à

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