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To [[inhale]] the [[diaphragm]] [[contract]]s and goes down while the [[Intercostal Muscle|intercostal muscles]] [[contract]] pulling the [[Rig Rib Cage|ribs]] upwards and outwards.
To [[exhale]] the [[diaphragm]] relaxes and goes up while the [[Intercostal Muscle|intercostal muscles]] relax allowing the [[Rig Rib Cage|ribs]] to go down and inward.
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|[[File:Breathing.gif|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |An animation of the lungs inhaling and exhaling.
===Inhaled Air===
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|[[File:InhaledAir.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |The percentage of different gases found in [[inhale]]d air.
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===Exhaled Air===
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|[[File:ExhaledAir.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |The percentage of different gases found in [[exhale]]d air.
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===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Breathing, pages 23, 60-61, 136-137, GCSE Biology; Third Edition, Oxford University Press, AQA '']