Biology 3.1.1 Gaseous exchange in boney fish

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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	Created by Sam Gunnell over 5 years ago