Gas exchange in fish.

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  • Created by: elyornais
  • Created on: 12-03-15 19:30
What are gills made up of?
Gill filaments stacked up in a pile, branching into gill lamellae.
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What is meant by the countercurrent flow?
Water flows in the opposite direction to blood.
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What is the advantage of the countercurrent flow?
Ensures that the maximum possible gas exchange is achieved. There is a diffusion gradient all the way across the gill which allows the diffusion of oxygen across the width of the gill.
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Describe two ways in which a diffusion gradient is maintained.
1.)Ventilation by water flow so new water is passed over their gills continuously. 2.)Countercurrent flow.
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What are the features that give gills a large surface area?
Lamellae on filaments and lots of both.
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What is the relationship between gill surface area and swimming speed?
More oxygen can be supplied for more respiration.
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Card 2

Front

What is meant by the countercurrent flow?

Back

Water flows in the opposite direction to blood.

Card 3

Front

What is the advantage of the countercurrent flow?

Back

Preview of the front of card 3

Card 4

Front

Describe two ways in which a diffusion gradient is maintained.

Back

Preview of the front of card 4

Card 5

Front

What are the features that give gills a large surface area?

Back

Preview of the front of card 5
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