Q: Which system is the autonomic nervous system a part of?  

Answer: B

The autonomic nervous system is a branch of the peripheral nervous system, which regulates and controls the involuntary functions of the body such as heart rate, digestion, and respiratory rate. The peripheral nervous system comprises the nerves and ganglia outside of the brain and spinal cord, including the somatic nervous system which controls voluntary movements and sensations, and the autonomic nervous system which controls involuntary functions. The autonomic nervous system can be further divided into the sympathetic and parasympathetic divisions, which have opposing effects on many organs and tissues in the body. Therefore, the correct answer is option B, the peripheral nervous system.

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