Respiratory system

2. when u exhale, the __________ relaxes and air is pushed out of the lungs.
4. made up of many cartilages and connects the pharynx to trachea.
8. the small terminal branches of the airways in the lungs.
10. bacteria, viruses and fungi causes it.
12. uncontrolled growth of abnormal cells in one or both lungs.
14. during this disease, person feels hard to breathe.
16. the main function is the filtration of air and is the external opening of the respiratory tract.
17. prevents the lungs from collapsing.
19. is also called oral cavity.

1. Maximum gas pressure that can be expelled by a deeper intake from the lungs.
3. inhaled air after passing through nasal and oral cavity passes through this muscular structure.
5. are airways that contain cartilaginous walls.
6. the cup-shaped structures found at the end of the terminal bronchioles.
7. consists of two-layered membrane that covers each lung.
9. associated with smoking cigarettes.
11. have swelling and inflammation in their bronchial tubes
13. tube-like structure that connects larynx to bronchi.
15. blood vessels that connect arteries and veins.
18. the cartilaginous structure that prevents the entry of food