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5 Written questions

5 Matching questions

  1. Describe two conditions that allow maintenance of the resting membrane potential. How are concentration gradients involved?
  2. Describe the ionic basis for an action potential (depolarization). What is the ionic basis for repolarization? What is hyperpolarization? What ions are involved?
  3. What gives peripheral nerves their white appearance?
  4. What is the most immediate effect of application of a threshold stimulus to a nerve fiber membrane?
  5. Motor neurons are located where? Sensory neurons are located where?
  1. a Mylination
  2. b PNS
    Everywhere except the brain
  3. c Depolarization - Potential difference becomes smaller or less polar. If extracellular concentration of K+ increases, there is less gradient between inside and outside.
    Hyperpolarization - Potential difference becomes greater or more polar. If extracellular concentration of K+ decreases, steeper gradient between inside and outside
  4. d ...
  5. e The fact that the cell membrane is relatively negative and they are charged ions inside and outside the cell.

    Concentration gradients involved because K+ ions are inside, Na+ ions are outside. Keep polarity of cell in check.

5 Multiple choice questions

  1. Yes
    Yes
  2. mV
  3. Schwann cells can point the neuron in the right direction so it can regrow to the proper receptor sites.
  4. A change in the membrane potential that is localized to one area of the plasma membrane. Also known as local potentials.

    Cannot travel long distances because they spread in a decremental fashion. They rapidly decrease in magnitude as they spread over the surface of the plasma membrane (teacher's voice in a large lecture hall)
  5. 3 Na out, 2 K in

5 True/False questions

  1. Exactly what is a nerve?Only allows certain things through.

          

  2. If a neuron synapses on a second neuron and drives the resting membrane potential further from threshold, what is this called? Where does it occur?The fact that the cell membrane is relatively negative and they are charged ions inside and outside the cell.

    Concentration gradients involved because K+ ions are inside, Na+ ions are outside. Keep polarity of cell in check.

          

  3. Where are interneurons or association neurons located?spatial variation of both electrical potential and chemical concentration across a membrane.

          

  4. What are the two major divisions of the nervous system? Name the three subdivisions of the PNS, and tell how they differ in functions. What are the two subdivisions of the Motor pathway system?3 Na out, 2 K in

          

  5. Which channels are activated for depolarization in an action potential?In the spinal cord

          

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