Biology, B2.2.1 Exchange and transport

  • Created by: jodie.g
  • Created on: 30-05-18 17:26
What is surface area to volume ratio?
The surface area per unit volume of an object.
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When the SA:V is larger, the diffusion rate is...
faster
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The larger the organism, the ... the SA:V
lower
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What are alveoli?
Alveoli are found in the lungs to maximise the rate of diffusion of oxygen into the bloodstream.
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What are villi?
villi are found in the walls of the small intestine to maximise the diffusion rate of digested food molecules into the blood.
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Why are transport systems needed?
Once a required substance is diffused into your body, it must be transported to where it is needed.
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What is the main transport system in animals?
The circulatory system
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What is the plant transport system?
Xylem and phloem tubes
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Card 2

Front

When the SA:V is larger, the diffusion rate is...

Back

faster

Card 3

Front

The larger the organism, the ... the SA:V

Back

Preview of the front of card 3

Card 4

Front

What are alveoli?

Back

Preview of the front of card 4

Card 5

Front

What are villi?

Back

Preview of the front of card 5
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