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Cell Communication

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Transcript

  • 1. Communication
    Comparison of the nervous and endocrine systems
  • 2. How does a Nerve Impulse work?
    • Sensation
    • 3. Stimuli are received by receptors
    • 4. Integration
    • 5. Interpretation of the stimulus to choose an appropriate response
    • 6. Reaction
    • 7. Usually activation of a muscle or gland
  • How does the message travel in the nervous system?
    dendrite
    synapse
  • 8. 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)
  • 9. Response to an external stimulus
  • 10. Response to an internal stimulus
    Draw a flow diagram to illustrate this feedback loop
  • 11. How does the endocrine system work?
    • Endocrine gland
    • 12. Produces hormone
    • 13. Hormone
    • 14. A chemical messenger that is secreted into the bloodstream
    • 15. Target cells
    • 16. Cells that have receptors for the hormone
  • How does the message travel in the endocrine system?
  • 17. Draw a flow diagram to illustrate this feeback loop
  • 18. 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