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hi and welcome to this video where were going to be running through all the things that you need to know for OCR a level biology module 3.1 so thats the module on exchange surfaces and also breathing so heres the kind of overview of the mind map what were gonna look at were gonna look at some stuff to do with surface area and why we need to have exchange systems were gonna look at the main human exchange system which is the lungs or the structure are the lungs and some of the different tissues that youd find in there including microscope images of those then were going to be looking at also to the lungs how we can track breathing using a respirometer and some of the graphs that well get with those were also going to look at exchange systems in fish and in insects and how those systems work differently so Ive set you this on teams this these images theres the a3 version and in here behind me now is the a full version which you can cut out cut the images and use them to make