Question

RESPIRATORY SYSTEM

6.What challenges to gas exchange do aquatic animals face? Terrestrial?

7.What is a “counter current exchange system”? Explain its role in fish gills.

8.Amphibians use 2 methods for respiration. What are they, and explain each. Why do amphibians use both methods?

9.Describe the five factors discussed in class affecting gas exchange. Apply these factors to the efficiency of a tracheal system, gills, lungs in mammals, lungs in birds.

10.Be able to identify a smoker’s lung versus a non-smoker’s lung.

Answer 1

6) Aquatic animals exchange of gases takes through the moist skin and gills. They utilize oxygen from the water . Oxygen from the water is taken by the gills but they cannot utilize oxygen from the air .

-------> When the aquatic animals are placed on the terrestrial environment , they cannot utilize the oxygen directly from air

------> In terrestrial environment inorder to exchange gases , animals need lungs to exchange gases but aquatic animals have gills , so they can't exchange gases