Lesson 7 of 9

Diffusion

Goal: Describe diffusion and its role in cells.

Puzzles for this lesson

Word search0 of 7 found Crossword0 of 39 letters

Brown tea spreading out from a tea bag through hot water

Diffusion is particles spreading out, from where there are lots to where there are few.

High concentration means lots of particles crowded together.
It happens by itself. The cell does not use any energy.
In your cells: oxygen and glucose diffuse in. Carbon dioxide diffuses out.

Your turn

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Check yourself

I can define diffusion using the word concentration.I can name substances that diffuse into and out of cells.I can say how temperature changes the rate.

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Key words in this lesson

Cell Smallest building block of a living thing

Diffusion Particles spreading from high to low concentration

For teachers: AQA 3.8.2 · Pearson Edexcel 4.1, 4.2, 4.3 in part · Cambridge 8Pf.07, 8Bs.04 in part