What is a function of the autonomic nervous system?

The autonomic nervous system plays a crucial role in regulating involuntary bodily functions, which includes processes such as heart rate, digestion, respiratory rate, and blood pressure. This system operates without conscious control, allowing the body to maintain homeostasis and respond automatically to internal and external stimuli. Its two main divisions, the sympathetic and parasympathetic nervous systems, manage different aspects of involuntary control—for instance, the sympathetic system prepares the body for 'fight or flight' responses, while the parasympathetic system promotes 'rest and digest' functions. This fundamental regulation of involuntary processes is essential for survival and well-being, distinguishing it from other functions such as voluntary movements, conscious thought, or sensory input processing.