LC Nervous system

  1. What is a neuron?
    a single nerve cell
  2. Sensory neuron
    Carry electrical messages (ions) to the central nervous system
  3. Motor neuron
    carry electrical messages away from the central nervous system
  4. What is an interneuron?
    convert sensory messages to motor messages in the brain/ spinal cord

    carries information between sensory and motor neurons
  5. Neurotransmitter
    A chemical produced by the synaptic swellings that carry an electrical impulse across the synaptic clef
  6. What is a reflex action?
    the immediate, involuntary and automatic response of the body to a stimulus not under conscious control
  7. What is the reflex arc?
    The Pathway taken by a reflex action through the spinal cord
  8. Grey matter
    rich in cell bodies
  9. White matter
    rich in axons
  10. What is the central nervous system?
    brain and spinal cord
  11. What is the peripheral nervous system?
    All nerves that feed into the central nervous system
  12. Axon
    carry impulses away from the cell body
  13. What is the ganglion
    A group of cell bodies located outside the CNS
  14. What is the threshold?
    The minimum stimulus needed to cause an impulse to be carried in a neuron
  15. What is the all or nothing law?
    if the threshold is reached an impulse is carried, but if the threshold is not reacted no impulse is carried
  16. What is the refractory period?
    A short time span after a neuron has carried an impulse during which a stimulus fails to cause a response
  17. What is the synapse?
    A region where two neurons come into close contact

    region including the axon of one neuron and dendrite of another neuron
  18. What is the synaptic clef?
    The tiny gap between the two neurons at a synapse.

    the gap between the axon of one neuron and dendrite of another neuron
  19. What is the function of the neurotransmitter?
    Chemical produced to carry electrical impulse across the synaptic clef gap.

    E.g include dopamine, acetylcholine, and noradrenalin
  20. What is a Schwann cell?
    • Cells lie end to providing a protective layer around the axon.
    • As well as a protective function, these cells act as an insulator and speed up the rate of transmission of the electrical impulse
  21. What is the myelin sheath
    Composed of lipids


    Acts as an insulator and speed up the rate of transmission of the electrical impulse
  22. Draw an image of the brain.
    And label all the parts
    Image Upload 1
Author
cat126
ID
351522
Card Set
LC Nervous system
Description
key words and flashcards
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