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==Key Stage 3==
[[File:BreathingSystemSimple.png|right|300px|thumb|This [[diagram]] shows the position of the '''diaphragm''' in the [[Breathing System|breathing system]].]]
===Meaning===
The [[diaphragm]] is a wall of [[muscle]] separating the [[organ]]s in the [[thorax]] from the [[organ]]s in the [[Abdomen (Human)|abdomen]].
==Key Stage 4==
[[File:BreathingSystemSimple.png|right|300px|thumb|This [[diagram]] shows the position of the '''diaphragm''' in the [[Breathing System|breathing system]].]]
===Meaning===
The [[diaphragm]] is a wall of [[muscle]] separating the [[organ]]s in the [[thorax]] from the [[organ]]s in the [[Abdomen (Human)|abdomen]].
===About the Diaphragm===
: The [[diaphragm]] is essential to allow [[vertebrate]]s to [[breath]] [[air]].
: When [[vertebrate]]s [[inhale]] the [[diaphragm]] contracts and when they [[exhale]] the [[diaphragm]] relaxes.
{| class="wikitable"
|-
|[[File:Breathing.gif|center]]
|-
| style="height:20px; width:400px; text-align:center;" |An animation of the lungs inhaling and exhaling.
|}