Answer:The autonomic nervous system is a part of the peripheral nervous system that acts largely unconsciously and regulates bodily functions, such as the heart rate, blood flow, breathing, digestion, pupillary response, urination, and sexual arousal. It also influences the function of internal organs, such as smooth muscle and glands, and the immune system. It is the primary mechanism in control of the fight-or-flight response and is regulated by integrated reflexes through the brainstem to the spinal cord and organs1.
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