Discussion about Autonomic Nervous System The autonomic nervous system is considered to be a critical component of the peripheral nervous system, and it is primarily involved in regulating the involuntary physiologic processes in the human body such as respiration, heart rate, digestion, sexual arousal, and blood pressure among others (Saladin, 2018). The autonomic nervous system is usually composed of three anatomically distinct divisions: parasympathetic, enteric, and sympathetic nervous systems (Saladin, 2018). While the parasympathetic nervous system (PNS) contains the efferent fibers provide motor output to the central nervous system (CNS), the sympathetic nervous system (SNS), on the other hand, includes the afferent fibers that usually provide sensory input to the central nervous (Saladin, 2018). A postganglionic neuron with a cell