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5 Written questions

5 Matching questions

  1. What is the refractory period (absolute and relative)? What are the ligand gated channels doing at this time?
  2. What is the role of a neurotransmitter? What is Ach? What are cholinergic synapses? What kind of transmitters are dopamine and serotonin?
  3. How is the sodium-potassium pump related to the resting potential of the nerve fiber?
  4. 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?
  5. How are electrical potentials of cell membranes measured?
  1. a mV
  2. b 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.
  3. c To travel across the synapse and get the action potential to the next neuron
    Ach is acetylcholine
    Cholinergic synapses -
  4. d Through Neurotransmitters
    Calcium has to go into the synapse to stimulate the vessels to open.
  5. e In order to get back to polarization, they have to pump in 3 Na out, 2 K in

5 Multiple choice questions

  1. 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. 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. PNS
    Everywhere except the brain
  4. Voltage Gated Na+ Channels
  5. IPSP, Inhibitory Post Synaptic Potential.
    Sensory Neurons

5 True/False questions

  1. What is summation? Temporal and spatial summation result in what?Certain stimulus happens repeatedly, and adds to threshold in order to get an action potential.
    Results in threshold


  2. What gives peripheral nerves their white appearance?Mylination


  3. Do CNS nerve fibers generally regenerate?Not really.


  4. What is the most immediate effect of application of a threshold stimulus to a nerve fiber membrane?Salutatory conduction of an action potential is when you jump from node to node.


  5. You may recall that a muscle fiber is an entire muscle cell; is a nerve fiber an entire neuron? (explain)Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.