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: 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.
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