Neurobiology Assessment (PNS)
Directions:  Treat this set of questions as a take-home assessment.  You are to give very complete and detailed answers.  I should not have to guess at what you mean.  Your answers should serve as explanations to someone who has never formally studied neurobiology.  Responses are to be typed (diagrams may be attached).

1. Draw a single myelinated (insulated) neuron.  Label all its parts and their respective functions.

2. What is myelin?  Why is it required for your nervous system to function properly?

3. Explain why damage to peripheral nerve fibers is reversible while damage to CNS nerve fibers is typically permanent.

4. Diagram unipolar, bipolar, and multipolar neurons and describe what functions each typically performs.

5. Describe (you may also include a diagram) what occurs in the process of a signal being sent along an axon (polarization, depolarization, and repolarization).  What must occur during each of these steps?

6. Describe the Na+/K+ pump and its role in polarizing the neuron.  Why is this   considered a form of active transport?

7. What is an action potential?  Explain how the ionic gates are controlled in such a way that this is an "all or nothing" phenomenon.

8. Draw and label the interaction between a presynaptic and postsynaptic neuron.  Include and label the following: presynaptic neuron, postsynaptic neuron, vescicles, neurotransmitters, receptors, and synapse.

9. Why do neurotransmitters bind only briefly to the receptors on the postsynaptic neuron?

10. Diagram and describe presynaptic inhibition.


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