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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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Nervous system

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.

  • There are three functions of the nervous system: sensory input, integration, and motor input.


  • 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.


  • 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.


  • 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.



Central nervous system
Central Nervous System systems:

  • 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.


  • These impulses systems: 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 systems:

  • 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.


  • The motor neurons are divided into the systems: 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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