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5 Written questions

5 Matching questions

  1. You may recall that a muscle fiber is an entire muscle cell; is a nerve fiber an entire neuron? (explain)
  2. Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.
  3. Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion?
  4. Motor neurons are located where? Sensory neurons are located where?
  5. What is a graded potential? Can it travel a long distance? Why or why not?
  1. a 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)
  2. b 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
  3. c PNS
    Everywhere except the brain
  4. d Sodium
  5. e No because the neuron consists of many other things that make up the neuron (dendrites, axons, cell bodies, axon terminals)

5 Multiple choice questions

  1. 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).
  2. To travel across the synapse and get the action potential to the next neuron
    Ach is acetylcholine
    Cholinergic synapses -
  3. mV
  4. EPSP - Excitatory Post Synaptic Potential; potential of the cell to reach threshold again after it has been through a cycle.
    IPSP - Inhibitory Post Synaptic Potential; Hyperpolarize on purpose to prevent a response to every stimulus.
  5. In the spinal cord

5 True/False questions

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


  2. Describe the structure of a typical neuron. Identify as to structure and function: a cell body; dendrite; axon; microtubules; Nissl bodies; axon hillock.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


  3. Exactly what is a nerve?A bundle of neurons that travel to and from the same place.


  4. What is salutatory conduction of an action potential? Does it occur in all nerve fibers? How does diameter of a nerve fiber affect speed of conduction?...


  5. What is axonal transport? What is the primary function of slow axonal transport vs fast axonal transport?Schwann Cell wraps around the axon to form the myelin sheath.
    Neurilemma is the plasma membrane of a neuron
    Ranvier is the space between mylination


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