Comparing Amphibian and Fish Hearts
Chapter 25: Fishes and Amphibians

As you have learned, fishes have a two-chambered heart. The fish heart pumps blood across the gills and then through the body. Amphibians have a three-chambered heart which allows partial separation of oxygen-rich blood and oxygen-poor blood. Develop a simple flow chart that shows the flow of blood through a fish. Be sure to include the atrium, the ventricle, the gills, and the body. Then, develop a simple diagram that shows the flow of blood through an amphibian heart. Be sure to include the right atrium, the left atrium, the ventricle, the body, and the lungs.

Analyze the Information

---

1. How does the fish heart compare to the amphibian heart?
2. Why is a double-loop circulatory system more efficient than a single-loop system?
3. Besides circulation of oxygen, what other method of gas exchange is used by amphibians?

TOP

Unit 7 Home Page