This video covers
- What diffusion is
- How it works
- How it applies to cell membranes
- The 3 factors that affect the rate of diffusion (concentration gradient, temperature, surface area)

Exam board specific info:

KS3
All relevant to KS3 course

GCSE
AQA - All on your course
IGCSE Edexcel - All on your course
Edexcel - All on your course
OCR 21st Century - All on your course
OCR Gateway - All on your course

A-level
If you're doing A-level biology you also need that longer diffusion distances will decrease the rate of diffusion because the particles have to travel further.

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