16810878
Description
Flashcards by Sam Gunnell, updated more than 1 year ago
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Created by Sam Gunnell
over 5 years ago
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| Question | Answer |
| What is the buccal cavity? | The mouth of the fish |
| Why must fish have lots of gasous exchange? | They are very active |
| How are gills adapted so that more gaseous exchange can occur? | They have thin layers so there is a short diffusion pathway they haev a large surface area |
| What is countercurrent flow? | Where two fluids flow in opposite directons |
| How do fish use countercurrent flow? | The blood and water flow in opposite directions |
| What is the operculum? | A boney flap that covers and protects the gills |
| Explain the opercular pump | The mouth opens and water moves into the buccal cavity. The mouth closes and the floor of the buccal cavity is raised, increasing the pressure and pushes water over the gills so that gaseous exchange can occur. |
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