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Diffusion In Fish Gills
- 1. Gas Exchange & Circulation Chapter 4 Gas Exchange in Animals
- 2. Why is gas exchange important? C 6 H 12 O 6 + O 2 Energy + CO 2 + H 2 O Energy + CO 2 + H 2 O C 6 H 12 O 6 + O 2 Photosynthesis: Respiration:
- 3. How can an organism get O 2 into its body? Diffusion.
- 7. O 2 diffuses from high concentration to low concentration.
- 9. Big aquatic animals usually have gills to provide surface area for gas exchange.
- 10. Fish usually need more oxygen than invertebrates; they have more gill area than most invertebrates.
- 11. Faster fish have bigger gills. index of relative gill surface area Mackerel: 2551 Toadfish: 137
- 13. Operculum in Fish 1-way flow of water across gills
- 16. Countercurrent exchange of O 2 in gills
Notas del editor
- It’s all about partial pressure.
- In a fish, oxygen moves from the surrounding water through the gills to the blood and finally the tissues. At each step, the oxygen level becomes lower -- otherwise the oxygen wouldn’t diffuse. This graph redrawn from Eckert & Randall (14-13).
- The numbers here show oxygen concentration as a percent of what the water or blood can hold (saturation). Water and blood carry different amounts of oxygen.