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==Key Stage 3==
===Meaning===
[[File:BicepTricep.png|right|300px|thumb|The [[bicep]] and [[tricep]] are an [[Antagonistic PairMuscles|antagonistic pair]] of [[muscle]]s.]]
[[Muscle]]s are [[organ]]s in the [[Muscular System|muscular system]] which allow us to move.
: 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"
| 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"
|-
|[[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}}
===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 ''Muscles, pages 10-11, 134, 136-138, GCSE Biology; Third Edition, Oxford University Press, AQA '']