Respiratory System

4. The epiglottis prevents _________ from entering the airway during swallowing.
7. Respiration involves inhalation & __________.
8. Look like small clusters of grapes.
9. Each lung is covered by a two-layered sac called.
11. ___________ brings oxygen into the lungs and eliminates carbon dioxide
13. Eventually, the bronchioles and end in tiny air sacs with a single cell layer.
16. Air enters the nose and passes into the ______.
17. Alveoli are surrounded by theses.
21. Every Cell Needs This To Survive

1. Another name for trachea.
2. These are spongy tissues filled with alveoli, blood vessels, and nerves.
3. The bronchus enters the lung and further divides into small branches called ___________.
5. Another name for the pharynx.
6. Breathing out
10. Lungs are separated from the abdominal cavity by a muscle called the _________.
12. Breathing In
14. The respiratory system is divided into the _____ respiratory tract and the lower respiratory tract.
15. During inhalation the epiglottis lifts up so that air passes over the larynx and into the _______
18. A piece of cartilage acts like a lid over the larynx.
19. The right lung has _____ lobes.
20. The voice box.