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===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.
===About the Nervous System===
: The '''nervous system''' is made of the [[brain]], the [[nerve]]s and the [[[Sensory Organ|sensory organs]].
: [[Drug]]s can affect the '''nervous system''' changing they way an [[animal]] senses changes in the environment and how quickly they can respond to them.
==Key Stage 4==
[[File:NervousSystem.png|right|300px|thumb|A [[diagram]] of the '''nervous system'''.]]
===About the Nervous System===
: The '''nervous system''' consists of the [[Central Nervous System]] (made of the [[brain]] and [[Spinal Cord|spinal cord]] and the [[Peripheral Nervous System]] (the other [[nerve]]sand the [[Sensory Organ|sense organs]]).
: The '''nervous system''' coordinates movements of an [[organism]].
: [[Simulant]]s affect the '''nervous system''' by increasing the speed of [[Impulse (Biology)|electrical impulses]] in the [[nerve]]s. This decreases [[Reaction Time|reaction time]].
: [[Depressant]]s affect the '''nervous system''' by decreasing the speed of [[Impulse (Biology)|electrical impulses]] in the [[nerve]]s. This increases [[Reaction Time|reaction time]].