Exchange surfaces

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  • Created by: Steff06
  • Created on: 08-04-16 10:57
What substances do living things need to stay alive?
Oxygen for aerobic respiration, glucose for energy, proteins for growth and repair, fats to make membranes and to store energy, water, minerals to maintain water potential and help enzyme action.
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What waste products do living things need to get rid of?
Carbon dioxide, oxygen, wastes e.g. ammonia and urea which contain excess nitrogen.
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How do organisms get hold of these substances?
Either by absorbing them from their surrounding environment or make them in their cytoplasm as part of cell metabolism.
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What do all good exchange surfaces have?
A large surface area to provide more space for molecules to pass through.A fresh supply of molecules on one side to keep the concentration high. Removal of required molecules on one side to keep the conc low.Thin barrier to reduce diffusion distance.
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What are examples of specialised exchange surfaces?
Alveoli in the lungs, small intestine where nutrients are absorbed, liver where levels of sugars in blood are adjusted, root hairs of plants where water and minerals are absorbed, hyphae of fungi, where nutrients are absorbed.
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Other cards in this set

Card 2

Front

What waste products do living things need to get rid of?

Back

Carbon dioxide, oxygen, wastes e.g. ammonia and urea which contain excess nitrogen.

Card 3

Front

How do organisms get hold of these substances?

Back

Preview of the front of card 3

Card 4

Front

What do all good exchange surfaces have?

Back

Preview of the front of card 4

Card 5

Front

What are examples of specialised exchange surfaces?

Back

Preview of the front of card 5

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