The peripheral nervous system is composed of nerves located outside the spinal cord of the brain. Afferent nerves carry sensory information from the body to the spinal cord and brain. Efferent nerves carry motor information from the brain and spinal cord to the body. Together the create a complete circuit.
Functional division of the nervous system are the voluntary nervous system and the autonomic nervous system. The voluntary nervous system includes the activity of skeletal muscles and movements. The autonomic nervous system is automatic. It influences the activity of smooth involuntary muscles and glands. It is partially independent of the rest of the nervous system. The autonomic nervous system is divided into sympathic nervous system and the parasympathetic nervous system. These two systems have opposite effects and act in a delicate balance. The sympathic nervous system is activated when the body is challenged by stressors, trauma, blood loss, fright and so on. It's known as the fright or fight response. The parasympathetic nervous returns the bodies process to normal or depresses body function. |
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