B2: Diffusion

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what is the definition for diffusion?
Diffusion is the net movement of particles from a region of high concentration to a region of low concentration, down a concentration gradient.
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Is diffusion passive or active, what does this mean?
Diffusion is a passive process. This means it requires no additional energy.
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Where does diffusion occur?
Diffusion occurs in gases, liquids and dissolved solids. it can occur through cell membranes and whole cells.
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What is needed for diffusion to occur?
Diffusion always occurs as long as there are two different concentrations of a substance: a concentration gradient.
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Why is diffusion needed?
Diffusion allows important biomolecules (oxygen, starch and glucose) to move around the body.
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What are the three factors that affect the rate of diffusion?
The three factors that affect the rate of diffusion are: surface area, distance and concentration.
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Explain how surface area affects diffusion and give an example of this in the body.
- A larger surface area allows more space for diffusion to happen. - This means more molecules can move in the same period of time, which means the rate of diffusion increases. - An example of this in the body is the intestine wall is highly folded
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Explain how distance affects diffusion and give an example of this in the body.
- If there is a shorter distance for the particles to travel, it will take less time - More molecules can move in the same period of time resulting in an increased rate of diffusion. - An example of this is that blood capillaries are only one cell t
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Explain how concentration affects diffusion and give an example of this in a plant.
- The greater the difference between the two concentration gradients (the steeper the concentration gradient), the larger the rate of diffusion. - An example is the greater yield of oxygen inside a palisade cells vs outside the cell, increases the ra
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Card 2

Front

Is diffusion passive or active, what does this mean?

Back

Diffusion is a passive process. This means it requires no additional energy.

Card 3

Front

Where does diffusion occur?

Back

Preview of the front of card 3

Card 4

Front

What is needed for diffusion to occur?

Back

Preview of the front of card 4

Card 5

Front

Why is diffusion needed?

Back

Preview of the front of card 5
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