NEURON PHYSIOLOGY

WORKSHEET  

1.       The first event that occurs to CREATE a depolarized neuron is_______

2.       The next even that occurs during the depolarization is_______________________ and it occurs at the ________________________

3.       In order to create an action potential at the axon hillock the following must occur ____________________________________________________

4.       There are three varieties of Na+ gates, describe them and their action(s) and where they are located. _______________________, _______________________, _______________

5.       Diagram  the location of each of the following ions to  show  the ion distribution of a resting neuron. Na+  Cl-   AN/Pr-   K+  Write the symbol LARGE if there is a greater amount in one area versus the other where you would write it small. What is the millivoltage of this neuron? _______

 

6.  following the same idea as in question number 5.  Show the ion distribution for a neuron that is depolarized.  What is the milivoltage of this neuron?____ what are the K+ kates doing at this time? ________

 

 7..       Following the same idea as in questions number 5 and 6, show the ion distrubution for a neuron that is conducting an action potential. What is the millivoltage of this neuron? _______. What are the K+ gates doing at this time? _____________

 

 

8.       Again, using the same format as the previous 3 questions,  show the ion distribution for a neuron that is hyperpolarized and experiencing the refractory period.  What is the millivoltage of this neuron? _______. What are the K+ gates doing at this time? _____________

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

 

9.  What must occur to return the neuron to its resting potential?___________________

_______________________________________________________________

 

10.  Why is it a safe bet to describe neuron physiology regarding conduction of an action potential an "electro-chemical event"?

 

11.   What "makes" the electrical current /action potential jump QUICKLY from one node of Ranvier to the next?  ___________________________________________________