Respiratory System

1. firm, flexible connective tissue found in various parts of the body, like your ear.
4. The flap that covers the trachea during swallowing so that food does not enter the lungs.
5. a small cavity or pit
8. breathing out
11. air passages inside the lungs that branch off like tree limbs from the bronchi
13. two bands of smooth muscle tissue found in the larynx (voice box).
14. The voice box
15. carries air, food and fluid down from the nose and mouth.

1. organisms use oxygen to break down food molecules to get chemical energy for cell functions.
2. pair of organs that supply your body with oxygen.
3. the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration.
6. situated between the ribs.
7. The large air passages that lead from the trachea (windpipe) to the lungs.
9. A protein inside red blood cells that carries oxygen from the lungs to tissues and organs in the body and carries carbon dioxide back to the lungs.
10. Breathing in
12. The windpipe