Respiratory System

1. A large airway that leads from the trachea to a lung.
3. delicate, double-layered serous membranes that cover the lungs
6. blood vessels that carry blood from and to the heart
9. major air passages of the lungs which diverge from the windpipe
11. a wall, dividing a cavity or structure into smaller ones
12. temporary stopping of breathing
15. the voice box
16. fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products
17. Tissue flap at the entrance to the trachea that closes when you swallow to keep food and liquids out of your airway
18. the windpipe
21. structure that separates the thoracic (chest) and abdominal cavities in mammals
24. the chest
25. pair of organs situated within the rib cage

1. take air into the lungs and then expel it
2. an infection that inflames the air sacs in one or both lungs
4. tiny air sacs of the lungs
5. oval-shaped cavity inside the skull
7. referred to by its formula CO2
8. the tube that connects the pharynx (throat) with the stomach
10. large, air-filled space above and behind the nose in the middle of the face
13. colorless, odorless, gaseous element
14. Bones that surround and protect your lungs and heart
19. absense of oxygen
20. membrane-lined cavity behind the nose and mouth, connecting them to the esophagus
22. the act of drawing air into the lungs
23. slimy substance