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→Key Stage 3
| style="height:20px; width:600px; text-align:center;" |When a [[muscle]] [[contract]]s it is called the 'agonist' and when it relaxes it is called the 'antagonist'.
|}
==Key Stage 4==
===Meaning===
[[Muscle]]s are [[organ]]s in the [[Muscular System|muscular system]] which allow us to move.
===About Muscles===
: [[Muscle]]s are made of [[Muscle Tissue|muscle tissue]].
: The [[Muscle Cell|cells]] in the [[muscle]]s have a special part called 'muscle fibres' which can make the [[Cell (Biology)|cells]] shorter or longer.
: When a [[muscle]] gets shorter it has [[contract]]ed and when a muscle gets longer it has relaxed.
: Most [[muscle]]s come in [[Antagonistic Muscles|antagonistic]] pairs. This means when one [[contract]]s the other must relax.
{| class="wikitable"
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|[[File:AntagonisticPair.png|center|600px]]
|-
| style="height:20px; width:600px; text-align:center;" |When a [[muscle]] [[contract]]s it is called the 'agonist' and when it relaxes it is called the 'antagonist'.
|}
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=2tM1LFFxeKg}}