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5 Written questions

5 Matching questions

  1. 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?
  2. What is an electrochemical gradient?
  3. Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.
  4. What is membrane permeability?
  5. Exactly what is a nerve?
  1. a spatial variation of both electrical potential and chemical concentration across a membrane.
  2. b IPSP, Inhibitory Post Synaptic Potential.
    Sensory Neurons
  3. c 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
  4. d Only allows certain things through.
  5. e A bundle of neurons that travel to and from the same place.

5 Multiple choice questions

  1. Voltage Gated Na+ Channels
  2. Takes one neuron to affect the other neuron and dictate a response.
    Receptor, sensory neuron, control center, motor neuron, effectors
  3. 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.
  4. Sodium
  5. Threshold Stimulus is the all or none principle. Resting potential -55mv. Has to bring it positive with K+ ions.

    Voltage Gated K+ Ions open up which allows K+ ions to enter the membrane.

5 True/False questions

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


  2. Are nerve fiber in the CNS mylelinated? Do they have a neurilemma?Yes


  3. 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?Through Neurotransmitters
    Calcium has to go into the synapse to stimulate the vessels to open.


  4. What is a presynaptic neuron? Postsynaptic neuron? Define converge, divergence of neurons.Takes one neuron to affect the other neuron and dictate a response.
    Receptor, sensory neuron, control center, motor neuron, effectors


  5. What is the refractory period (absolute and relative)? What are the ligand gated channels doing at this time?Absolute Refractory Period - complete insensitivity exists to another stimulus. Voltage gated Na+ Channels open and close.
    Relative Refractory Period - follows the absolute period, membrane is more permeable to K+ because many voltage gated K+ channels are open.