Respiratory System

1. Smaller tubes inside the lungs leading from the bronchus to the alveoli
3. The process of taking air into the lungs and then expelling it
9. The voicebox - forms an air passage to the lungs
10. Breathing out
12. A colourless gas which is produced by respiration
14. The volume of air in the lungs
15. Tiny air sacs at the end of the bronchioles - where gas exchange happens
16. The part of the throat behind the mouth and nasal cavity

1. Tubes leading from the trachea to the lungs
2. Breathing in
4. When air passages in the lungs narrow due to inflammation of muscles
5. A flap of cartilage behind the root of the tongue
6. The life-supporting component of air
7. The windpipe - it leads from the nose and mouth to the two bronchi
8. Tiny hair-like projections which line parts of the lungs and respiratory tract
11. Contains gas exchange surfaces
13. Works with the intercoastal muscles to allow ventilation to happen