Edexcel IGCSE Biology · Spec 2.16
Factors Affecting Diffusion and Movement Rate
Covers recall the four factors affecting movement rate, Explain each factor using particles and Apply the factors to biological exchange surfaces.
Biology revision video
Factors Affecting Diffusion and Movement Rate
Prefer to watch on YouTube? Open this video on YouTube.
Spec 2.16
What you need to know
- Recall the four factors affecting movement rate
- Explain each factor using particles
- Apply the factors to biological exchange surfaces
Active recall
Quick check
Answer each question before opening the answer.
Name the four factors affecting movement rate
Surface area-to-volume ratio, distance, temperature and concentration gradient
Why do one-cell-thick walls increase diffusion rate?
They create a short diffusion distance
How does ventilation maintain rapid oxygen diffusion?
It replaces oxygen-depleted air and maintains a steep oxygen concentration gradient
Biology video companion
Keep your notes and exam practice together
The free Biology workbook follows every video in specification order.