1.1.7

Diffusion

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Diffusion

Substances can enter and leave cells in a process called diffusion.

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The role of diffusion

  • It is important that substances can move both into and out of cells.
    • We want oxygen to diffuse into cells because it is needed for life.
    • We want carbon dioxide to diffuse out of cells as it is a waste product.
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Diffusion

  • Some substances move in and out of cells by a process called diffusion.
  • This is where particles move from an area of high concentration to an area of low concentration.
    • In the same way, air freshener particles will spread around a room if sprayed into one corner.

Jump to other topics

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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