Key term for Edexcel GCSE Biology, used in Exchange Surfaces.
The difference in the concentration of a substance between two connected areas or regions.
Concentration gradient appears in Edexcel GCSE Biology revision content for Exchange and Transport in Animals, especially Exchange Surfaces and Factors Affecting Diffusion.
Exchange and Transport in Animals
Exchange Surfaces • Factors Affecting Diffusion
Exchange and Transport in Animals
Exchange Surfaces • Alveoli
Animal Coordination, Control and Homeostasis
The Urinary System • Kidney Failure Treatments
Plant Structures and Functions
Plant Transport • Factors Affecting Water Uptake
Key Concepts in Biology
Food and Transport • Transport in Cells
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