Combined Science GCSE
Gas exchange
What Gas exchange means in Combined Science GCSE, as defined for AQA.
Definitions of Gas exchange
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Reference: AQA
A process in which oxygen diffuses into cells and carbon dioxide diffuses out of cells because each gas moves down its own concentration gradient.
Carbon dioxide diffuses in through open stomata for photosynthesis and oxygen diffuses out.
The process at the lungs that loads oxygen into the blood and removes carbon dioxide.
Topics that use Gas exchange
- Diffusion (AQA GCSE)
- Plant organ system (AQA GCSE)
- The heart and blood vessels (AQA GCSE)
Related terms
- Surface area
- Active transport
- Adaptations of exchange surfaces
- alveoli
- Arteries
- Blood supply
- Calculating rates from measurements
- Capillaries
Using Gas exchange in the exam
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