B3 1.4: Exchanging materials.

All information was taken directly from the AQA revision guide with only the key points from B3 1.4

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  • Created by: JSpencer
  • Created on: 03-03-16 18:42
What do large complex organs have? Why?
Special exchange surfaces so that they can obtain all the food and oxygen they need.
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What are solutes?
The solid that dissolves in a solvent to form a solution.
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What is absorbed by the lungs?
Oxygen.
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What is removed from the lungs?
Carbon dioxide.
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What are efficient exchange surfaces?
Large surface area, thin walls or short diffusion path and efficient transport system.
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What is an example of an efficient transport system?
The blood supply in animals.
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What do the lungs also contain?
A gaseous exchange system.
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How is the surface area of the lungs increased?
By the alveoli (air sacs)
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What do alveoli have?
Thin walls, a large surface area and a good blood supply.
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Why are the lungs ventilated?
To maintain a steep diffusion gradient.
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Where does oxygen diffuse into?
Many cappilaries surronding the alveoli.
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Where does carbon dioxide diffuse into?
Back out into the lungs to be breathed out.
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Other cards in this set

Card 2

Front

What are solutes?

Back

The solid that dissolves in a solvent to form a solution.

Card 3

Front

What is absorbed by the lungs?

Back

Preview of the front of card 3

Card 4

Front

What is removed from the lungs?

Back

Preview of the front of card 4

Card 5

Front

What are efficient exchange surfaces?

Back

Preview of the front of card 5
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