Cell Communication
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Cell Communication

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    Cell Communication Cell Communication Presentation Transcript

    • Communication
      Comparison of the nervous and endocrine systems
    • How does a Nerve Impulse work?
      • Sensation
      • Stimuli are received by receptors
      • Integration
      • Interpretation of the stimulus to choose an appropriate response
      • Reaction
      • Usually activation of a muscle or gland
    • How does the message travel in the nervous system?
      dendrite
      synapse
    • Because neurons never touch, chemical signalers called neurotransmitters must travel through thespace called the synapse,between two neurons.
      Neurotransmitters
      (pink
      spheres)
      The message is transferred whenRECEPTORSreceive neurotransmitters.
      Synapse (gap)
    • Response to an external stimulus
    • Response to an internal stimulus
      Draw a flow diagram to illustrate this feedback loop
    • How does the endocrine system work?
      • Endocrine gland
      • Produces hormone
      • Hormone
      • A chemical messenger that is secreted into the bloodstream
      • Target cells
      • Cells that have receptors for the hormone
    • How does the message travel in the endocrine system?
    • Draw a flow diagram to illustrate this feeback loop
    • Comparison of endocrine and nervous systems
      Chemical only
      Chemical & electrical
      Hormone
      Neurotransmitter
      Through the blood
      Along the nerves
      Slow
      Fast
      Action lasts a long time
      Action lasts a short time
      Lots because it is diluted as it travels through the body
      A little because it is delivered directly to the place it is needed
      Any cell with the receptor
      Nerves, muscles, glands