RESPIRATORY SYSTEM

2. Organs that facilitate gas exchange between the body and the environment
3. The hollow space inside the nose
7. The voice box, located at the top of the trachea
11. The process of exchanging oxygen and carbon dioxide between the blood and the alveoli
13. Folds of tissue in the larynx that vibrate to produce sound
16. The process of breathing in, taking oxygen into the body
17. A thin membrane that covers the lungs and lines the inside of the chest cavity
18. A flap of cartilage that covers the trachea during swallowing to prevent food or liquid from entering the lungs
19. Smaller branches of the bronchi that lead to the alveoli
20. A gas essential for life, which is absorbed by the body's cells

1. A waste gas produced by the body's cells
4. Tubes that branch off from the trachea and lead to the lungs
5. The throat, which connects the nasal and oral cavities to the larynx
6. The mechanical process of moving air in and out of the lungs
8. Tiny air sacs in the lungs where gas exchange takes place
9. The overall process of breathing, including inhalation, gas exchange, and exhalation
10. The process of breathing out, expelling carbon dioxide from the body
12. Hair-like structures that line the respiratory tract and help to remove mucus and debris
14. The windpipe, which connects the larynx to the bronchi
15. A muscle that plays a key role in breathing