Movement In and Out of Cells: Diffusion, Osmosis & Active Transport
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Movement In and Out of Cells: Diffusion, Osmosis & Active Transport
An audio revision episode covering Edexcel GCSE Biology Topic 1.3 — Movement of Substances Into and Out of Cells. We cover diffusion and the factors that affect it, how to calculate surface area to volume ratios, osmosis in animal and plant cells, the potato cylinder practical, and active transport with its key examples in animals and plants.
2026/6/11 · 0:44
Episode Overview
This episode covers Edexcel GCSE Biology Topic 1.3 — Movement of Substances Into and Out of Cells, sourced directly from Save My Exams revision notes. The episode is structured in four chapters:
- Diffusion — what it is, how it works in living organisms, and the four factors that affect its rate (concentration gradient, surface area to volume ratio, diffusion distance, and temperature), including how to calculate surface area to volume ratios.
- Osmosis — the definition with water potential, osmosis in animal cells (crenation and lysis) vs plant cells (turgid, flaccid, plasmolysis), and the classic potato cylinder investigation.
- Active Transport — the definition, energy requirement, protein carriers, and key examples in animals (glucose absorption in the small intestine, kidney tubule reabsorption) and plants (mineral ion uptake by root hair cells).
- Exam Comparison & Key Tips — a side-by-side summary of all three processes and five targeted exam-technique tips.
Sources
- Diffusion (Edexcel GCSE Biology): Revision Note
- Osmosis (Edexcel GCSE Biology): Revision Note
- Active Transport (Edexcel GCSE Biology): Revision Note
All revision content sourced from Save My Exams — savemyexams.com. Exam board: Edexcel. Exam code: 1BI0.
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