Diffusion

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What kind of transport is diffusion?
Passive
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What is the definition of diffusion?
Net movement of molecules/ions from a region where they are highly concentrated to a lower concentration.
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How does concentration gradient affect the rate of diffusion?
The greater the difference in concentration of molecules on either side of the exchange surface, the faster the rate.
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How does area affect diffusion?
Larger the area, faster the rate.
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How does the thickness of exchange surface affect diffusion?
Thinner the surface, faster the rate.
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What is diffusion proportional to?
Surface area x Difference in concentration divided by length of diffusion path
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What does facilitated diffusion rely on?
The kinetic energy of diffusing molecules.
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Where on a plasma membrane does facilitated diffusion occur?
Where protein molecules are found.
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In facilitated diffusion, what do proteins on the plasma membrane form and what does this allow?
Protein channels across the membrane; allows water-soluble ions to pass through.
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What does another form of facilitated diffusion involve?
Carrier proteins that span the plasma membrane.
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How is a molecule released inside the membrane via carrier proteins?
The molecule will be specific to the carrier and bind to it, changing its shape and then being released into the membrane.
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Other cards in this set

Card 2

Front

What is the definition of diffusion?

Back

Net movement of molecules/ions from a region where they are highly concentrated to a lower concentration.

Card 3

Front

How does concentration gradient affect the rate of diffusion?

Back

Preview of the front of card 3

Card 4

Front

How does area affect diffusion?

Back

Preview of the front of card 4

Card 5

Front

How does the thickness of exchange surface affect diffusion?

Back

Preview of the front of card 5
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