Changes

: 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]] and the [[Sensory Organ|sense organs]]).

: The '''nervous system''' coordinates movements of an [[organism]].

: [[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]].