Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 1. at level of 6th cervical vertebrae 4. separates thorax from abdomen 5. inflamed pleura with painful respiration 6. sore throat 7. runs from larynx to the bronchi 8. form from branches of the secondary bronchi 9. level with 3rd cervical vertebrae just below mandible 12. small almond shaped lymphoid tissue masses 13. contains heart, great vessels, thymus gland, trachea & right & left bronchi, esophagus 14. consist of thorax & abdomen 15. covers lungs and adheres firmly to their surface 17. common cold 18. very small air sacs deep in lungs where oxygen & carbon dioxide are exchanged

Down: 2. detects possibility of peritoneal irritation 3. accomplished by relaxation of diaphragm 10. thyroid cartilage 11. most common injury to throat 16. tubelike structure from base of skull to esophagus