8.1 & 8.2

5. A frog remains inactive at the bottom of a pond. Which respiratory structure is mainly used for gaseous exchange?
7. If the number of lamellae in a fish decreases, this feature of the respiratory surface will decrease.
8. This respiratory structure in human has the shortest diffusion distance because its wall is only one cell thick.
9. A grasshopper's spiracles are blocked. Which respiratory surface can no longer receive oxygen?CARBONDIOXIDE Gas that makes bread rise
10. This characteristic allows oxygen and carbon dioxide to dissolve before diffusion occurs.

1. A fish is removed from water and cannot carry out gaseous exchange effectively because its respiratory structure dries up.
2. This network surrounding the alveoli helps transport respiratory gases quickly.
3. This process causes oxygen to move from the alveolus into the blood capillaries.
4. During inhalation, this muscle contracts and becomes flat.
6. A fish continuously opens and closes this structure to help water flow across the gills.