Respiratory System

3. The substance secreted by alveolar cells to reduce surface tension and prevent alveolar collapse
6. A device used to measure lung volumes and capacities
10. The volume of air that reaches the respiratory zone each minute
11. The transport method by which gases move across the alveolar-capillary membrane
13. This enzyme converts carbon dioxide to carbonic acid
15. A measure of the lung's ability to stretch and expand in response to pressure changes
16. This volume is the amount of air that can be forcibly exhaled after normal exhalation
17. A chemoreceptor location that detects blood CO₂ levels

1. The maximum amount of air that can be exhaled after a maximum inhalation
2. This protein in red blood cells binds oxygen for transport
4. The amount of air inhaled or exhaled in one breath during normal breathing
5. The volume of air that remains in the lungs after maximal exhalation
7. The lung disease characterized by loss of elastic recoil and decreased FEV1
8. The primary site of gas exchange in the lungs
9. This is the primary muscle used for inhalation
12. Another name for the wind pipe
14. The molecule primarily responsible for stimulating breathing by affecting pH
18. A chronic disease that causes airway inflammation and bronchoconstriction