Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

is the collective term used to describe the system of neurons, nerves, tracts and other tissues, with the endocrine system, coordinates the activities and responses to environmental and internal and external stimulations of an organism.

NERVOUS SYSTEM: "The nervous system, as a whole, is the collection of structures from neurons to nerves and the bones which support them in the human body."

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