Respiratory system

3. The main muscle of respiration, located below the lungs, assisting in breathing.
7. The amount of air involved in a single breath.
8. The specialized tissue lining the respiratory tract, containing mucus and cilia.
10. The process of moving air in and out of the lungs.
13. A condition where oxygen levels in the tissues are too low.
15. A temporary cessation of breathing.
16. A substance in the alveoli that reduces surface tension and prevents collapse.
18. The process of oxygen binding to hemoglobin for transport in the blood.
19. A test measuring lung function, including airflow and volume.
20. A double-layered membrane surrounding the lungs, reducing friction during respiration.

1. Small airways branching from the bronchi, leading to the alveoli.
2. A tube that connects the larynx to the bronchi, allowing air passage to the lungs.
4. Tiny air sacs in the lungs where gas exchange occurs between air and blood.
5. The total volume of air the lungs can hold.
6. The brainstem region that controls breathing.
9. The process of drawing air into the lungs.
11. The process of expelling air from the lungs.
12. The exchange of oxygen and carbon dioxide in the alveoli.
14. Large airways branching from the trachea and leading to the lungs.
17. An excessive level of carbon dioxide in the blood.