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==Key Stage 3==
===Meaning===
[[File:BicepTricep.png|right|300px|thumb|The [[bicep]] and [[tricep]] are an [[Antagonistic Pair|antagonistic pair]] of [[muscle]]s.]]
[[Muscle]]s are [[organ]]s in the [[Muscular System|muscular system]] which allow us to move.
===About Muscles===
: Most muscles come in [[antagonistic]] pairs. This means when one contracts the other must relax.
{| class="wikitable"
|-
|[[File:AntagonisticPair.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |When a [[muscle]] [[contract]]s it is called the 'agonist' and when it relaxes it is called the 'antagonist'.
|}