C3 - Crossword Labs

4. The tiny air sacs in lungs where gas exchange occurs.
6. The phenomenon where increased CO2 and acidity (pH) lower hemoglobin’s oxygen affinity.
8. The hierarchical structure of the respiratory system to maximize surface area.
9. The pressure exerted by a single gas in a mixture of gases.
10. A hormone that stimulates red blood cell production in response to low oxygen levels.
14. A process where fish swim with their mouths open to force water over gills.
15. A respiratory pigment that stores oxygen in muscle tissues.
16. The small airways that lead to alveoli in the lungs.
17. The principle describing gas diffusion based on surface area, thickness, and pressure gradients.
21. The portion of the respiratory system where no gas exchange occurs.
23. The structure of respiratory surfaces in fish for gas exchange.
24. The primary form in which CO2 is transported in blood.
26. The main respiratory pigment that transports oxygen in blood.

1. The primary respiratory structures in terrestrial vertebrates.
2. CO2 bound to hemoglobin for transport.
3. Sensors that detect changes in CO2, O2, and pH to regulate breathing.
5. The region of the brain that controls breathing regulation.
6. A method of actively moving water over gills for respiration.
7. The mechanism where oxygen binding to hemoglobin increases its affinity for more oxygen.
11. The cells responsible for gas exchange in alveoli.
12. The total pressure exerted by all gases in the atmosphere.
13. The immune cells, also known as dust cells, that remove debris and pathogens from alveoli.
18. The partial pressure of oxygen at which hemoglobin is 50% saturated.
19. A type of hemoglobin with a higher oxygen affinity than adult hemoglobin.
20. A molecule that decreases hemoglobin’s oxygen affinity, promoting oxygen release.
22. The factor that decreases atmospheric pressure, affecting oxygen availability.
25. TypeIICells The cells that produce surfactant to reduce surface tension in alveoli.