8th Grade Health Term Exercise - Chapter 3 Match each term in the middle to the correct definition.         phlegm mucus external pleura thoracic allergens nasal cavity sinuses trachea alveoli bronchioles cellular pharynx respiration internal respiratory diaphragm cilia mucous membrane bronchi       1. the system which carries out respiration. 11. throat             2. process by which cells use oxygen is called _______ respiration 12. branch off from the trachea       3. the gas exchange between cells and blood is ______ respiration 13. branch out from the bronchi like twigs on a tree             4. the process by which the energy of digested food is made available to your body 14. lungs are located in the ____ cavity 5. ______ respiration is exhaling and inhaling air (breathing) 15. thin slippery membrane which covers the lungs             6. windpipe 16. tiny air sacs at the end of the respiratory passages 7. tiny hair-like structures that moves mucus to the pharynx 17. muscle that separates the thoracic cavity from the abdominal cavity             8. collects pathogens and dust in your nose from the air you breathe 18. thick mucus in the throat             9. sticky substance that pathogens cling to preventing them from reaching the lungs 19. substances that irritate and cause sneezing and wheezing             10. air passes through the _____ on its way to your lungs 20. air-filled cavities located inside certain facial bones