Eating, Drinking and Breathing .2 0.0 / 5 ? BiologyRespiration and exerciseGCSEAQA Created by: _kate_maeCreated on: 03-04-17 18:01 alveoli (or Alveolus) where gas exchange occurs in the lungs 1 of 5 cappillary small blood vessel 2 of 5 particle very small part of material, such as an atom or molecule 3 of 5 concentration amount of something per unit volume - for example sugar in water 4 of 5 semi-permeable membrane allows some but not all particles to pass through. 5 of 5
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