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Gas exchange and diffusion
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Diffusion and concentration gradients

Diffusion and concentration gradients

Particles in gases and liquids move randomly because they have kinetic energy. This constant motion means they spread out over time.

Gas exchange and diffusion Lesson

  1. A Level
  2. /Biology
  3. /Gas exchange and diffusion

Step-by-step lessons on Edexcel A A Level Biology Gas exchange and diffusion. Each one builds up to exam-style questions. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.

Lessons