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5 Written questions

5 Matching questions

  1. How are electrical potentials of cell membranes measured?
  2. What is the role of a neurotransmitter? What is Ach? What are cholinergic synapses? What kind of transmitters are dopamine and serotonin?
  3. Do CNS nerve fibers generally regenerate?
  4. Define excitability. What kinds of cells possess excitability?
  5. Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.
  1. a To travel across the synapse and get the action potential to the next neuron
    Ach is acetylcholine
    Cholinergic synapses -
  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 Able to receive impulse from action potentials
    Contractible cells
  4. d Not really.
  5. e mV

5 Multiple choice questions

  1. Active
  2. 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
  3. Takes one neuron to affect the other neuron and dictate a response.
    Receptor, sensory neuron, control center, motor neuron, effectors
  4. Through Neurotransmitters
    Yes
    Calcium has to go into the synapse to stimulate the vessels to open.
  5. Presynaptic - The neuron that sends the action potential to the next dendrite
    Postsynaptic - Receives the message
    Convergence of Neurons - First one neuron is influenced by many others, resulting in a convergence of input.
    Divergence of Neurons - When the neuron fires, the signal is sent to many other neurons, resulting in a divergence of output.

5 True/False questions

  1. What is axonal transport? What is the primary function of slow axonal transport vs fast axonal transport?Axonal transport is a cellular process responsible for movement of mitochondria, lipids, synaptic vesicles, proteins, and other cell parts (i.e. organelles) to and from a neuron's cell body, through the cytoplasm of its axon

          

  2. What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both?Voltage Gated Na+ Channels

          

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

          

  4. Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion?Only allows certain things through.

          

  5. What advantage does having a myelin sheath give to a nerve fiber?Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.