Which system has divisions that regulate stress-related responses?

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The autonomic nervous system coordinates stress-related responses automatically, without you thinking about it. It has two main divisions: the sympathetic division, which activates the body for a “fight or flight” response during stress (increasing heart rate, redirecting blood to muscles, releasing energy), and the parasympathetic division, which calms the body down afterward to restore balance. This division is specifically responsible for regulating automatic bodily functions under stress, making it the best fit for the question. The central nervous system handles processing and decision-making, while the peripheral nervous system includes nerves that carry signals to and from the CNS but doesn’t itself regulate stress responses as directly. The endocrine system does influence stress via hormones, but the question focuses on divisions that actively regulate the stress response, which the autonomic nervous system does.