Everything CCEA students need to know about the respiratory system for GCSE Biology. BBC Homepage. Skip to ... A large diffusion gradient – allows efficient gas exchange as carbon dioxide ...

Alveoli are tiny air sacs in your lungs that take up the oxygen you breathe in and keep your body going. Although they’re microscopic, alveoli are the workhorses of your respiratory system ...

Most exercise scientists would agree that the physiological determinants of peak endurance performance include the capacity to transport oxygen to the working muscle, diffusion from the muscle to the ...