Diffusion is the net movement of particles from an area of high concentration to an area of lower concentration. It describes the movement of particles in fluids (liquids and gases). The particles all move randomly.
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Name an example of diffusion
When you spray perfume, the smell diffuses across the room from the high concentration (where you just sprayed it) to low concentration (the other side of the room).
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Name three factors affecting diffusion
Membrane surface area, concentration gradient (the difference in concentration between two areas.) and Temperature (the higher it is the higher the rate of diffusion)
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Do single-celled organisms have a large or small surface area:volume ratio
large. Consequently, the diffusion of molecules into and out of the cell is an efficient way to meet the organism’s needs.
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How are alveoli specialised to transfer gases in the lungs
They have a large surface area
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What is a waste product removed during diffusion?
Carbon Dioxide
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Other cards in this set
Card 2
Front
Name an example of diffusion
Back
When you spray perfume, the smell diffuses across the room from the high concentration (where you just sprayed it) to low concentration (the other side of the room).
Card 3
Front
Name three factors affecting diffusion
Back
Card 4
Front
Do single-celled organisms have a large or small surface area:volume ratio
Back
Card 5
Front
How are alveoli specialised to transfer gases in the lungs
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