What is the definition of diffusion?
The net movement of particles, from an area of higher concentration, to an area of lower concentration.
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What are the 4 main factors that affect the rate of diffusion across a membrane?
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Is diffusion an active or passive process?
Diffusion is a passive process because it doesn’t require any energy from the cell.
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Why does a higher temperature increase the rate of diffusion?
Higher temperature means particles have more (kinetic) energy.
So particles move around more quickly, and can diffuse more quickly.
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Explain the role of diffusion in gas exchange.
Oxygen diffuses from the alveoli, into the bloodstream.
Carbon dioxide diffuses from the bloodstream, into the alveoli.
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In the diagram above, the particles will move via diffusion. In what direction would you expect the particles to move?
The particles would move from B (a region of higher concentration) to A (a region of lower concentration).
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