Respiratory system

2. prevents the lungs from collapsing.
4. bacteria, viruses and fungi causes it.
5. uncontrolled growth of abnormal cells in one or both lungs.
8. have swelling and inflammation in their bronchial tubes
10. blood vessels that connect arteries and veins.
11. inhaled air after passing through nasal and oral cavity passes through this muscular structure.
14. associated with smoking cigarettes.
16. made up of many cartilages and connects the pharynx to trachea.
17. during this disease, person feels hard to breathe.

1. the small terminal branches of the airways in the lungs.
3. the muscles located between ribs.
6. is also called oral cavity.
7. Maximum gas pressure that can be expelled by a deeper intake from the lungs.
9. are airways that contain cartilaginous walls.
11. consists of two-layered membrane that covers each lung.
12. the main function is the filtration of air and is the external opening of the respiratory tract.
13. the cartilaginous structure that prevents the entry of food
15. when u exhale, the __________ relaxes and air is pushed out of the lungs.
17. the cup-shaped structures found at the end of the terminal bronchioles.
18. tube-like structure that connects larynx to bronchi.