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==Key Stage 3==
[[File:NervousSystem.png|right|300px|thumb|A [[diagram]] of the '''nervous system'''.]]
===Meaning===
The '''nervous system''' is an [[Organ System|organ system]] which detects changes in the environment and allows the body to respond to those changes.
==Key Stage 4==
[[File:NervousSystem.png|right|300px|thumb|A [[diagram]] of the '''nervous system'''.]]
===Meaning===
The [[Nervous System]] is an [[Organ System|organ system]] which sends [[Impulse (Biology)|electrical impulses]] around the body to detect changes in the environment and respond to those changes.