The Respiratory System

4. This is C-shaped cartilage that allows the esophagus to stretch into the trachea.
5. This is also known as your "windpipe." It is responsible for transporting air for respiration from the larynx to the bronchi.
7. It is commonly called the throat and it connects the nasal and oral cavities to the larynx and esophagus.
8. This structure covers the trachea to prevent food and drink from going down the airway.
9. These bronchi have 5 branches.
12. It serves as an air passage in the upper part of the throat behind the nose.
13. A muscular and cartilaginous structure that holds the vocal cords. This organ is used to breathe, talk and swallow.
14. These look like tiny grapes used for gas exchange. They are one cell layer thick of simple squamous cells.
15. The left lung has 7-8 branches of these bronchi, while the right lung has 9.
16. A common passageway for air, food and drink. Two tonsils are located here.
18. The two bronchi branches that come from the trachea.

1. The nasal fold in between the upper and lower folds of the nose.
2. This helps us to breathe, smell, filter air that travels to our lungs and also helps us to taste.
3. These allow the exchange of air and gas between the alveolar sacs and the terminal bronchioles.
5. This type of cartilage is considered to be your "adam's apple."
6. The lower nasal fold of the nose.
9. Type II cells secrete this substance.
10. The upper nasal fold of the nose.
11. This is where both food and air pass. It can be found between the hyoid bone and the larynx and esophagus, which helps guide food and air where to go.
17. This action kills Type II cells, destroys the elastic net, and causes the alveolar sacs to stick together and collapse.