Swim bladders in fish and lungs in terrestrial animals have a common evolutionary origin, but have evolved to perform different functions. What is the primary function of swim bladders in fish? They serve as buoyancy control organs. They filter toxins from the water. They allow fish to absorb most of their oxygen. They help in the digestion of food.

Swim bladders in fish and lungs in terrestrial animals have a common evolutionary origin, but have evolved to perform different functions. What is the primary function of swim bladders in fish? They serve as buoyancy control organs. They filter toxins from the water. They allow fish to absorb most of their oxygen. They help in the digestion of food.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter39: The Respiratory System

Section: Chapter Questions

Problem 1VCQ: Figure 39.7 Which of the following statements about the mammalian respiratory system is false? When...

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Gas bladders make up an average of 5 percent of body volume in marine fish and 7 percent of body volume (on average) in freshwater fish. What is the reason for this difference? freshwater fish have a larger average body size than salt water fish it is more difficult to produce lift swimming in freshwater than swimming in saltwater freshwater fish need to have a lower overall body density in order to remain neutrally boyant freshwater fish need to have a higher overall body density in order to remain neutrally boyant
Sponges and cnidarians have no lungs or gills. How do they exchange gases with the environment? Are humans better off having lungs? If so, how?
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