Exchanging materials - the lungs 2.0 / 5 based on 1 rating ? BiologyExchange of materialsGCSEAQA Created by: Hannah TaylorCreated on: 11-05-13 20:09 What gaseous exchange occurs in the lungs? Oxygen is absorbed by the lungs and Carbon Dioxide is removed from them 1 of 6 What are the features of an efficient exchange surface? They have a large surface area, thin walls (a short diffusion path) and a rich blood supply 2 of 6 What is the surface area of the lungs increased by? The surface area is increased by many alveoli (air sacs) 3 of 6 What are the adaptions of an alveoli? The alveoli have thin walls (one cell thick), a large surface area and a good blood supply in order for diffusion to take place efficiently 4 of 6 Why are the lungs ventilated? The lungs are ventilated to maintain a steep diffusion gradient 5 of 6 Where does oxygen diffuse into? The capillaries surrounding the alveoli 6 of 6
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