Apedia

Water Blood Fish Gills Oxygen Concentration Oxygen;  Replaces

Front A fish uses its gills to absorb oxygen from water. Explain how the gills of a fish are adapted for efficient gas exchange. ( 6 marks)
Back 1 Large surface area provided by lamellae/filaments;
2 Increases diffusion/makes diffusion efficient; 
3 Thin epithelium/distance between water and blood; 
4 Water and blood flow in opposite directions/countercurrent; 
5 (Point 4) maintains concentration gradient (along gill)/equilibrium not reached;
6 As water always next to blood with lower concentration of oxygen; 
7 Circulation replaces blood saturated with oxygen; 
8 Ventilation replaces water (as oxygen removed);

Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.

Next card: Gas exchange fish takes place gills explain features

Previous card: Insect oxygen air tracheae;  cells;  lives describe obtain

Up to card list: AQA Biology Flashcards