# Autonomic nervous system

> The autonomic nervous system controls the involuntary activities of the internal organs, such as the heartbeat, the rate of breathing, digestion, the size of the pupils and the secretion of glands…

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## More in RESPONDING TO THE ENVIRONMENT (Humans)

- [Peripheral nervous system](https://www.hlayiso.com/grade-12/life-sciences/notes/responding-to-the-environment-humans/peripheral-nervous-system) — Previous section
- [Structure and functioning of a nerve](https://www.hlayiso.com/grade-12/life-sciences/notes/responding-to-the-environment-humans/structure-and-functioning-of-a-nerve) — Next section
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