Respiratory System

1. The flap that covers the trachea during swallowing so that food does not enter the lungs
4. A semi-rigid but flexible avascular connective tissue found at various sites within the body
6. A tube about 4 inches long and less than an inch in diameter in most people
7. Composed of twin infoldings of mucous membrane stretched horizontally across the larynx
9. The passageways that connect your windpipe to your lungs
11. A pair of organs in the chest that supplies the body with oxygen
13. The process by which organisms combine oxygen with foodstuff molecules
14. A hollow tube that starts behind the nose, goes down the neck, and ends at the top of the trachea and oesophagus
16. Iron-containing protein in the blood of many animals

2. A group of muscles found between the ribs which are responsible for helping form and maintain the cavity produced by the ribs
3. The flow of the breath out of an organism
5. A tiny branch of air tubes in the lungs
8. The net movement of molecules from an area
10. The drawing of air or other substances into the lungs
12. Where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out
15. The area of the throat containing the vocal cords and used for breathing, swallowing, and talking