biology crossword

10. to take air in and expel it out of the lungs.
11. two bag-like organs that fill most of the chest. The lungs draw in air through the trachea and bronchi.
12. a part of the respiratory system between the pharynx and the trachea. It houses the vocal cords.
13. tiny blood vessels.
15. a flap of tissue that prevents food from going down the trachea rather than the oesophagus.
16. rate: the rate, or number of breaths per minute, at which we breathe.
18. a large muscle below the ribs that helps a person breathe.
19. a gas in air that humans and most living things need to live.
21. cords: two folds of tissue in the larynx that vibrate when air passes over them and produce sound, including the basic sounds of speech.
24. pair of tubes between the trachea and the lungs.
25. the basic unit of any living thing. Some living things consist of only a single cell, while others are composed of trillions of cells
26. breathe out.

1. one of the lung's smallest air passageways.
2. the air passageway between the pharynx and the bronchi.
3. tiny air sacs in the lungs.
4. a sticky substance in the nose that traps dirt, dust and other particles.
5. the tube that carries food from the back of the throat to the stomach.
6. a breathing disorder in which the air passageways in the lungs constrict, causing shortness of breath.
7. capacity: the volume of air that the lungs can hold.
8. the movement of oxygen from the atmosphere to cells and carbon dioxide from cells to the atmosphere.
9. hair-like structures found in the air passageways of the respiratory system.
14. system: the group of organs that take in oxygen from the air and release carbon dioxide.
17. a disease that damages the alveoli, making it difficult to get enough oxygen.
20. dioxide: a gas that is a waste product of cells when they burn food.
22. a cavity behind the nose and mouth that leads to the trachea and oesophagus.
23. breathe in.