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Gas exchange
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Diffusion drives gas exchange

Diffusion drives gas exchange

Gas exchange is the movement of oxygen and carbon dioxide between an organism and its surroundings. It happens by diffusion, which is the net movement of particles from a region of higher concentration to a region of lower concentration.

Gas exchange Lesson

  1. IGCSE
  2. /Biology
  3. /Gas exchange

Step-by-step lessons covering Edexcel IGCSE Biology Gas exchange for IGCSE Biology. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational cell biology and core content before moving on to the more data-heavy ecology, genetics and practical-skills topics, which carry a large share of the exam marks.