Exchange Surfaces

  • Created by: me543
  • Created on: 22-02-18 14:02
How can a unicellular organism cope with a lack of specialist exchange surfaces?
They have a large SA:VOL ratio, and therefore the rate of diffusion is enough to fulfil their needs.
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What is an exchange surface?
A specialised area that is adapted to make it easier for molecules to pass from one side of the surface to the other
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Name three examples of specialist exchange surfaces...
tracheal system in insects, gills in fish, lungs in mammals
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Why does the surface area need to be moist?
So the molecules can dissolve and diffuse across
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Main key features for efficient gas exchange?
large SA, large SA:VOL ratio, thin barrier, good blood supply, ventilation, high conc. gradient, moist surface.
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Other cards in this set

Card 2

Front

What is an exchange surface?

Back

A specialised area that is adapted to make it easier for molecules to pass from one side of the surface to the other

Card 3

Front

Name three examples of specialist exchange surfaces...

Back

Preview of the front of card 3

Card 4

Front

Why does the surface area need to be moist?

Back

Preview of the front of card 4

Card 5

Front

Main key features for efficient gas exchange?

Back

Preview of the front of card 5

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