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| Term | Definition |
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| autonomic nervous system | division of the peripheral nervous system that controls involuntary activities not under conscious control such as heart rate and digestion. |
| motor division | division of the peripheral nervous system; carries nerve impulses from the central nervous system to muscles and glands throughout the body. |
| parasympathetic division | division in the autonomic nervous system that controls involuntary activities that are not emergencies, such as controlling the organs in the digestive system. |
| peripheral nervous system | one of two main parts of the human nervous system that includes nerves that run throughout the body and consists of all the body’s nervous tissue except for the brain and spinal cord. |
| sensory division | division of the peripheral nervous system that carries messages from sense organs and internal organs to the central nervous system. |
| somatic nervous system | division of the peripheral nervous system that controls voluntary, conscious activities and reflexes. |
| sympathetic division | division in the autonomic nervous system prepares the body for “fight or flight" to deal with emergency situations. |