Diffusion

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Define diffusion.
The net movement of particles from an area of high concentration to an area of low concentration.
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When does net movement suspend?
When the particles are evenly spread throughout the liquid/gas.
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What is meant by the term 'passive process'
It means it can occur without energy
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Define simple diffusion.
Simple diffusion is when particles diffuse directly through a cell membrane.
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Name one thing the rate of diffusion depends on.
EITHER : concentration gradient, thickness of exchange surface or surface area.
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Why does the rate of diffusion rely on the concentration gradient?
Because the higher this is, the higher the rate of diffusion
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State what is meant my an equilibrium.
It means that the 'highest' rate has been reached and its impossible for it to go any faster.
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What is facilitated diffusion required for?
Large particles and/or charged particles.
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Briefly describe the process of facilitated diffusion using carrier proteins.
Firstly a large molecule attaches itself to a carrier protein at a binding site, then the protein changes shape in order to release the molecule on the opposite side of the membrane.
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How do channel proteins work?
They form pores in the membrane charged particles to diffuse through.
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What type of proteins are used to facilitate diffusion of charged particles?
Channel Proteins
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What type of proteins are used to facilitate diffusion of large molecules?
Carrier Proteins
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Why does the rate of facilitated diffusion rely on the number of transport proteins?
Because once you use up all the proteins, the rate can never be increased even if you increase the conc. gradient.
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How would you calculate the rate of diffusion on a straight line graph?
Work out the gradient.
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I draw a tangent and then work out the gradient of the tangent to calculate the rate of diffusion. What type of graph was it?
A curved graph
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What is the unit for diffusion?
MS-1
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Other cards in this set

Card 2

Front

When does net movement suspend?

Back

When the particles are evenly spread throughout the liquid/gas.

Card 3

Front

What is meant by the term 'passive process'

Back

Preview of the front of card 3

Card 4

Front

Define simple diffusion.

Back

Preview of the front of card 4

Card 5

Front

Name one thing the rate of diffusion depends on.

Back

Preview of the front of card 5
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