AQA GCSE Physical Education · 8582
Paper 1
Revise: Gaseous exchangeGases cross the alveolar and capillary walls by diffusion: the net movement of particles from an area of higher concentration to an area of lower concentration. A difference in concentration between two areas is called a concentration gradient.
- Revise: Cardiac cycle and blood pathway
The movement of particles from an area of higher concentration to an area of lower concentration.