The Nervous System
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The Nervous System

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The Nervous System The Nervous System Presentation Transcript

  • Regulation:The Nervous System Class Notes September 26, 2007
  • What are the parts of the Nervous System? The nervous system plays a major role in regulation. Nervous System Peripheral Nervous System (PNS) Central Nervous System (CNS) Nerves or Neurons Brain Spinal Cord
  • PNS: Nerve cell or Neuron
  • Nerves
    • Nerves: bundles of neurons
    • 4 types of neurons:
    • - Sensory Neurons
    • - Motor Neurons
    • - Mixed nerves
    • - Interneurons
  • CNS: This is your Brain
    • Cerebrum: 4 lobes
    • Cerebellum: balance and coordination
    • Medulla: involuntary functions (e.g. heartbeat)
    • Brainstem: regulates basic functions
  • This is Homer’s Brain
  • CNS: Spinal Cord
    • Mass of nerve cells protected by bones called vertebrae
    • Part of the CNS
    • Relays impulses to the brain
  • Nerve Regulation: What happened during the water lab?
    • Stimulus: a specific change in the environment that affects the nervous system (ex: change in water temp)
    • Impulse: electrical or chemical message that is carried by nerve cells; sent to CNS to interpret message (ex: message was carried to the brain through nerve impulses)
    • Response: reaction to the stimulus (ex: cold water feeling hot and hot water feeling cold when placed in med temp)
  • Reflex Arc