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Download 3 Transport in cells Homework task Diffusion in the lungs This
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3 Transport in cells Homework task Diffusion in the lungs This diagram shows the following: the position of the lungs in the body alveoli (single: alveolus) in the lungs how carbon dioxide and oxygen diffuse across the alveolus wall and the blood capillary wall. 1 Describe what happens to the air in the lungs when we breathe. What happens to the concentration of carbon dioxide and to the concentration of oxygen? --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------2 When is the concentration of oxygen in the alveoli the greatest: when you have breathed in fully or when you have breathed out fully? ---------------------------------------------------------------------------------------------------------------------------3 Which way does oxygen diffuse when the concentration of oxygen in the alveolus is higher than in the blood capillary? ---------------------------------------------------------------------------------------------------------------------------4 What happens when the concentration of carbon dioxide in the blood of the capillary is higher than in the air in the alveolus? ---------------------------------------------------------------------------------------------------------------------------5 Apart from gas concentration, what other factors are likely to affect diffusion of gases into and out of the alveoli? ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------6 Someone with cystic fibrosis produces a lot of mucus that builds up in the lungs. Why would this affect oxygen intake into the blood? ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- © Hodder & Stoughton Limited 2016 3 Transport in cells Homework task 7 Draw diagrams of an alveolus and a blood capillary to show how oxygen and carbon dioxide diffuse. Use symbols to represent oxygen molecules and carbon dioxide molecules. © Hodder & Stoughton Limited 2016
