The Autonomic Nervous System

The Autonomic Nervous System - The Autonomic Nervous System

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The Autonomic Nervous System The peripheral nervous system consists of the  somatic nervous system (SNS)  and the  autonomic  nervous system (ANS).  The SNS consists of motor neurons that stimulate skeletal muscles. In  contrast, the ANS consists of motor neurons that control smooth muscles, cardiac muscles, and  glands. In addition, the ANS monitors visceral organs and blood vessels with sensory neurons,  which provide input information for the CNS.  The ANS is further divided into the sympathetic nervous system and the parasympathetic nervous  system. Both of these systems can stimulate and inhibit effectors. However, the two systems work in  opposition—where one system stimulates an organ, the other inhibits. Working in this fashion, each  system prepares the body for a different kind of situation, as follows:  The  sympathetic nervous system  prepares the body for situations requiring alertness 
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The Autonomic Nervous System - The Autonomic Nervous System

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