Friday, January 27, 2012

CNS Central Nervous System

recall that the central nervous system consists of the brain and spinal cord and is linked to sense organs by nerves

1. The nervous system allows to the body to respond to changes in the environment (stimuli)
2. This consists of: the brain, the spinal cord and all of the nerves that branch off from the spinal cord.   

3. The CNS refers to only the brain + spinal cord. 
4. Impulses from receptors pass along the sensory nerves until they reach the brain + spinal cord.
5. 2 ways in which the CNS handles these changes

  • a response co-ordinated by the brain (slower way of responding)
  • reflex actions (these are extra-rapid responses to stimuli that by-pass the brain)

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