SYSTEMS

3. also called the windpipe, widest passageway in the respiratory tract
5. liquid portion of the blood
6. tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place
8. pumps blood throughout the circulatory system
10. a nerve that makes you able to smell
13. carry oxygen to other cells of the body
16. a large, air-filled space in the skull above and behind the nose in the middle of the face
19. inflammation in the airways that can make breathing difficult
21. blood vessel that carries blood back to the heart
23. complex protein on red blood cells
24. largest organs of the respiratory tract
25. the life-sustaining process in which gases are exchanged between the body and the outside atmosphere
28. blood cell that carries oxygen and carbon dioxide.
29. tissue that flows through the circulatory system

1. the narrowest airways of the bronchial tree
2. largest artery in the body
4. blood vessel that connects arterioles with venules
7. the airway in the respiratory tract that conducts air into the lungs
9. bones that surround and protect your lungs and heart
11. also known as thrombocytes
12. help your body fight infection
14. also called the voice box
15. muscular wall that separates the heart into a right and left side
17. lower chamber of the heart
18. tiny hairs that move in a wave-like motion to filter dust and other irritants out of your airways
20. blood vessel that carries blood away from the heart
22. tissue flap at the entrance to the trachea that closes when you swallow to keep food and liquids out of your airway
26. a tube-like structure that connects the nasal cavity and the back of the mouth to other structures lower in the throat
27. upper chamber of the heart
30. muscle that helps your lungs pull in air and push it out