Concentration gradients
What Concentration gradients means in Biology GCSE, as defined for AQA.
Definitions of Concentration gradients
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Reference: AQA
If there is a higher concentration of a substance on one side of the membrane than the other, random movement produces a net transfer towards the lower concentration.
A rich blood supply, a dense capillary network, ventilation and counter-current blood flow all maintain a steep concentration gradient so diffusion continues.
Active transport moves substances against a concentration gradient, from a more dilute solution to a more concentrated solution.
Substances are moved against a concentration gradient, from a more dilute solution to a more concentrated solution.
Topics that use Concentration gradients
- Active transport (AQA GCSE)
- Diffusion (AQA GCSE)
Related terms
- Concentration gradient
- Diffusion
- Respiration
- Active transport
- Aerobic respiration
- Anaerobic respiration
- Carrier proteins
- Diffusion and concentration gradients
Using Concentration gradients in the exam
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