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Nervous System. 12/7/2009. The nervous system is the body’s control center . The nervous system allows us to think, evaluate, and remember information . The most important part of the nervous system is the neuron or nerve cell .

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The nervous system is the body’s control center.
  • The nervous system allows us to think, evaluate, and remember information.
  • The most important part of the nervous system is the neuron or nerve cell.
  • There are three functions of the nervous system: sensory input, integration, and motor input.
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Sensory input– When the eyes see something or hands touch a warm surface, the neurons send a message straight to the brain.
  • This action of getting information from the surrounding environment is called sensory input because things are being sent to the brain by way of the senses.
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Integration– The interpretation, or translation, of things that have been felt, tasted, and touched with the sensory neurons into responses that the body recognizes.
  • This process is accomplished in the brain.
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Motor output– Once your brain has interpreted all that has been sent by using any of the senses, then your brain sends a message through neurons to muscle or other cells, which work to perform the response.
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The human nervous system is divided into two different systems: The central and the peripheral nervous systems.
central nervous system
Central Nervous System
  • It is the body’s most rapid means of maintaining homeostasis.
  • The central nervous system regulates vital bodily functions by sensing changes within the body and from the environment.
  • It interprets the changes and makes adjustments in a split-second by delivering impulses.
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These impulses result in muscular contractions and/or glandular secretions.
  • The central nervous system consists of the brain and the spinal cord and association neurons.
    • These neurons make up most of the spinal cord and change the input impulse to output impulses and cause the body to respond.
peripheral nervous system
Peripheral Nervous System
  • two types of neurons in this system: sensory and motor
  • Sensory neuronssend information to the central nervous system from internal organs and from the environment
  • motor neurons send impulses to the voluntary and involuntary muscles.
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The motor neurons are divided into the somatic nervous system and the autonomic nervous system.
  • The skeletal muscles and external sensory organs such as the skin are controlled by the somatic nervous system.
  • This system is said to be voluntary because the responses can be controlled consciously.
  • An exception is the reflex reactions of skeletal muscle. These are involuntary reactions to external stimuli.
  • The autonomic nervous system controls involuntary muscles such as smooth and cardiac muscle. This system is also called the involuntary nervous system.
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