# Human nervous system

> Humans need a nervous system for two reasons: to react to stimuli, both outside and inside the body, and to coordinate the activities of the different parts of the body. This section explains these…

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## More in RESPONDING TO THE ENVIRONMENT (Humans)

- [Introduction](https://www.hlayiso.com/grade-12/life-sciences/notes/responding-to-the-environment-humans/introduction) — Previous section
- [Central nervous system](https://www.hlayiso.com/grade-12/life-sciences/notes/responding-to-the-environment-humans/central-nervous-system) — Next section
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