Respiratory system

4. muscles, muscles between the ribs that help expand and shrink the chest during breathing
7. the voice box that also directs air into the trachea
10. a flap of tissue that prevents food from entering the airway
13. thin membranes that protect and cushion the lungs
14. the external opening that allows air to enter the respiratory system

1. an alternate entryway for air into the respiratory system
2. two main air passages that lead from the trachea into each lung
3. smaller branches of the bronchi that carry air deeper into the lungs
5. the throat area that carries air from the nose and mouth to the larynx
6. a muscle under the lungs that helps with breathing by contracting and relaxing
8. cavity, warms, moistens, and filters the air you breathe
9. tiny air sacs where oxygen and carbon dioxide are exchanged
11. the windpipe that carries air from the larynx to the bronchi
12. the main organs of the respiratory system where gas exchange occurs