Exchange and Transport

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Why do organisms need special exchange surfaces?
All organisms need special exchange surfaces to get the substances they need to survive. These include oxygen for respirtation, glucose for energy, proteins for growth and repair, water, fats for building membranes and for energy, minerals
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What waste products must be removed after their production through metabolic processes in the cytoplasm?
Carbon dioxide, Urea, Ammonia and Oxygen (for some plants)
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What are the features of a good exchange system?
Large surface area to volume ratio, short diffusion pathway, steep concentration gradient
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Why do large, active organisms need specialised exchange systems?
They have a small surface area to volume ratio and so diffusion is too slow, the diffusion pathway is too great a distance and diffusion would be too slow, they are metabollically active and most are warm blooded and so need to a good supply of nutri
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How is a plant root adapted for taking in water and mineral ions
Large surface area to volume ratio as there are lots of them, very thin - short diffusion pathway, shape can pentrate through soil
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What are the lungs?
Large pair of inflatable structures in the chest cavity
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What are the lungs?
Large pair of inflatable structures in the chest cavity
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How does air flow through the body?
Mouth and nose - trachea - bronchi - bronchioles - alveoli
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Where does exchange in the lungs take place?
In the alveoli
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What are the lungs?
Large pair of inflatable structures in the chest cavity
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How does air flow through the body?
Mouth and nose - trachea - bronchi - bronchioles - alveoli
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Where does exchange in the lungs take place?
In the alveoli
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What is an exchange surface?
A specialised area that is adapted to make it easier for molecules to cross from one side of the surface to the other
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What is gaseous exchange?
The m
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What are the lungs?
Large pair of inflatable structures in the chest cavity
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How does air flow through the body?
Mouth and nose - trachea - bronchi - bronchioles - alveoli
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Where does exchange in the lungs take place?
In the alveoli
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What is an exchange surface?
A specialised area that is adapted to make it easier for molecules to cross from one side of the surface to the other
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What is gaseous exchange?
The movement of gases by diffusion between its organism and its environment across a barrier (such as the alveolus wall)
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Other cards in this set

Card 2

Front

What waste products must be removed after their production through metabolic processes in the cytoplasm?

Back

Carbon dioxide, Urea, Ammonia and Oxygen (for some plants)

Card 3

Front

What are the features of a good exchange system?

Back

Preview of the front of card 3

Card 4

Front

Why do large, active organisms need specialised exchange systems?

Back

Preview of the front of card 4

Card 5

Front

How is a plant root adapted for taking in water and mineral ions

Back

Preview of the front of card 5
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