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.
Step-by-step lessons on Edexcel IGCSE Biology Gas exchange. Each one builds up to exam-style questions. 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.