BIOL 223 Chapter 12-2

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BIOL 223 Chapter 12-2
2011-11-02 18:34:26
anatomy physiology neurons

Study Cards for Chapter 12 BIOL 223 CSN
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  1. List the four structural classes of neurons discussed in class.
    • anaxonic
    • bipolar
    • unipolar
    • multipolar
  2. An neuron whose axons and dendrites are indistinguishable is an:
    anaxonic neuron
  3. Where in the human body do we find anaxonic neurons?
    • the brain
    • special sense organs
  4. An axon with two processes, one on each end, is called a:
    bipolar neuron
  5. Which structural type of neuron is the most rare?
    bipolar neurons
  6. A neuron with one process leaving the cell body that splits into dendrites and synapses is a(n):
    unipolar neuron
  7. All sensory neurons are _______ neurons.
  8. A neuron with an axon on one end and multiple dendrites on the other end is a:
    multipolar neuron
  9. Which type of neuron is the most common?
    multipolar neurons
  10. Motor neurons are _______ neurons.
  11. Somatic sensory neurons carry information from sensory receptors to the:
    central nervous system
  12. True or False: We are aware of the information being transmitted by somatic sensory neurons.
  13. List the three functional classes of neurons discussed in class.
    • sensory neurons
    • motor neurons
    • interneurons
  14. Visceral sensory neurons carry information about your _______ to the CNS.
    organ systems
  15. Are we aware of the information being transmitted by visceral sensory neurons?
    no, we are not
  16. List the three types of sensory receptors discussed in class.
    • interoceptors
    • proprioceptors
    • exteroceptors
  17. Organ systems and sense of taste are monitored by:
  18. Muscle position and tension of ligaments and tendons are monitored by:
  19. Which type of receptor monitors the external environment, tactile receptors, and the remaining special senses?
  20. What is the purpose of interneurons?
    to integrate somatic and motor neural systems
  21. Which functional type of neurons are involved in higher function and outnumber the other types of neurons?
  22. What type of cell myelinates neurons?
    schwann cells
  23. Which type of propagation involves unmyelinated axons?
    continuous propagation
  24. List the four steps of continuous propagation discussed in class.
    • axon hillock depolarizes (+30 mV) and action potential reaches 1st subunit opening sodium channels
    • sodium diffuses towards the 2nd subunit and brings it to threshold
    • voltage-gated channels open, sodium flows in, segment 2 depolarizes to +30 mV
    • process then repeats
  25. List the four steps of saltatory propagation discussed in class.
    • intial segment depolarizes to +30 mV
    • sodium ions diffuse to node 1 and bring it to threshold
    • voltage-gated channels open and node 1 depolarizes
    • process continues
  26. Which type of propagation is faster, continous or saltatory?
  27. Which type of neurons are myelinated and have the largest diameter?
    type A neurons
  28. Which type of neurons are myelinated with an intermediate diameter?
    type B neurons
  29. Which type of neuron in unmyelinated with the smallest diameter?
    type C neurons
  30. Which neuron will communicate faster, a large myelinated neuron, or a small unmyelinated neuron?
    large, myelinated neuron