Respiratory System

4. The number of breaths taken per minute.
7. The process of taking in oxygen and expelling carbon dioxide through the lungs.
8. Tiny air sacs in the lungs where gas exchange occurs.
12. The waste gas produced by cells during metabolism and expelled through exhalation.
14. The process by which oxygen from the air is transferred to the blood and carbon dioxide is removed from the blood.
16. The act of breathing out, where carbon dioxide is expelled from the lungs.
17. Tiny hair-like structures in the respiratory system that help trap and move particles out of the airways.
18. The windpipe that carries air from the mouth and nose to the bronchi.

1. Smaller branches of the bronchi that carry air into the lungs.
2. The muscle beneath the lungs that helps with breathing by contracting and relaxing.
3. The voice box, located in the throat, which contains the vocal cords.
5. Blood that has been enriched with oxygen in the lungs and is ready to be transported to body tissues.
6. The throat area that connects the mouth and nose to the larynx and esophagus.
9. The act of breathing in, where air enters the lungs.
10. The pair of organs responsible for gas exchange in the body.
11. The gas that is inhaled into the lungs and delivered to the bloodstream for use by the body.
13. The two main branches that split from the trachea and lead into each lung.
15. The bony structure that surrounds and protects the lungs and heart, aiding in the expansion and contraction during breathing.