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5 Written questions

5 Matching questions

  1. Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion?
  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. Motor neurons are located where? Sensory neurons are located where?
  4. Define excitability. What kinds of cells possess excitability?
  5. Describe the structure of a typical neuron. Identify as to structure and function: a cell body; dendrite; axon; microtubules; Nissl bodies; axon hillock.
  1. a Dendrites coming into cell body
    cell body contains the nucleus goes into the axon starting with the axon hillock
    the axon travels down to axon terminals
  2. b PNS
    Everywhere except the brain
  3. c Able to receive impulse from action potentials
    Contractible cells
  4. d 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
  5. e Sodium

5 Multiple choice questions

  1. Takes one neuron to affect the other neuron and dictate a response.
    Receptor, sensory neuron, control center, motor neuron, effectors
  2. Salutatory conduction of an action potential is when you jump from node to node.
  3. Yes
  4. ...
  5. 3 Na out, 2 K in

5 True/False questions

  1. What advantage does having a myelin sheath give to a nerve fiber?Mylination


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


  3. How are nerve impulses transmitted across synapses? Compare this to transmission of an impulse from nerve fiber to muscle fiber. Is transmission of the impulse across a synapse one-way? What role does calcium play in the release of a neurotransmitter?Central Nervous System (CNS) and Peripheral Nervous System (PNS)

    Somatic (Voluntary)
    Autonomic (involuntary). Within this, there are Sympathetic (Fight or Flight) and Parasympathetic (Rest and digest).


  4. Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.Type A - large-diameter, myelinated. Conduct at 15-120 m/s. Motor neurons supplying skeletal and most sensory neurons
    Type B - medium-diameter, lightly myelinated. Conduct at 3-15 m/s. Part of ANS
    Type C - small-diameter, unmyelinated. Conduct at 2 m/s or less. Part of ANS


  5. Do CNS nerve fibers generally regenerate?A bundle of neurons that travel to and from the same place.


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