The Alveoli 0.0 / 5 ? BiologyAlveoliGCSEEdexcel Created by: Jazzy15Created on: 13-03-19 19:33 What are alveoli adapted for ? They are adapted for GAS EXCHANGE by diffusion between air in the lungs and blood in capillaries 1 of 14 What sty-stem are the lungs a part of ? The breathing system 2 of 14 What does the breathing system do ? It takes air into and out of the body 3 of 14 What happens in the lungs ? (point 1) Oxygen diffuses from the air into the blood 4 of 14 What happens in the lungs ? (point 2) Carbon dioxide diffuses from the blood into the air 5 of 14 What are lungs adapted to do ? They are adapted for efficient gas exchange 6 of 14 What are air sacs ? Millions of tiny alveoli -erve to increase respiratory efficiency by providing a large surface area for gas exchange. 7 of 14 What is the bronchi ? A bronchi is a passage of airway in the respiratory system that conducts air into the lungs. 8 of 14 Describe an alveolus Their walls are one cell thick, minimising diffusion distance 9 of 14 Breathing of alveolus and continual blood flow through capillaries maintains .... con gradient to .... high concentration gradient, to MAXIMISE RATE OF DIFFUSION 10 of 14 In lung infections, fluid builds up inside the alveoli. Explain why this makes it harder for the person to breathe properly This reduces the surface area of alveoli over which diffusion can take place and so decreases the rate of gas exchange 11 of 14 State on way in which the air breathed out is different from air breathed in (1) breathe in less oxygen (1) breathe out more carbon dioxide 12 of 14 People who smoke have fewer alveoli, and the alveoli are large. Explain why smokers may sometimes become sort of breath reduced surface area and less oxygen absorbed 13 of 14 Explain the advantages of the alveoli having many capillaries around them maintains a concentration gradient and surface area is larger for exchange 14 of 14
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