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Respiratory system - Coggle Diagram

- - - - Makes the pressure inside the lungs lower than air outside your body, the lungs fill up with outside air. Then the diaphragm relaxes and the pressure inside the lungs becomes higher than the outside air pushing it out.
- - - - They used simple diffusion "when a material automatically flows from where it is concentrated, to where it is less concentrated, so it balances out"
        
        needed something different because diffusion wasn't very effective in anything larger than a worm.
        
        they moved their respiratory surfaces moved from their outer surfaces to the insides of their bodies.
        
        Gills
        
        simple diffusion doesn't work very effectively because of too many obstacles in the way for the oxygen molecule to get to the cell and gets blocked by the skin, skull, etc.
        
        instead we use bulk flow, moving large numbers of molecules quickly
        
        Your body uses both bulk flow and simple diffusion