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level: 6.3 Gas exchange in fish

Questions and Answers List

level questions: 6.3 Gas exchange in fish

QuestionAnswer
Structure of fish gills- Made up of gill filaments, stacked up - At right angles to filaments are gill lamellae - Lower concentration of oxygen in water
Adapations of lamellae and gill filaments- Increases SA - Lamellae have lots of blood capillaries + thin - shorter diffusion path
The counter-current system for gas exchange- Water, with oxygen, enters the mouth of the fish - Passes out of gills - Blood flows through the lamellae in 1 direction - Water flows over in the opposite direction
Purpose of counter-current system- Maintains a large concen.grad. between water + blood - The concentration of oxygen in water is always higher than in the blood - So as much oxygen as possible diffuses from the water into the blood