Zoo/Psych/Neurosci 523
Daughter of Exam 1
2008
NO CALCULATORS!
1) (20 points;
5 points each)
Please describe briefly:
a) Divergent neuron.
A divergent neuron is one that received relatively few inputs and makes synaptic output to a relatively
large number of postsynaptic neurons.
b) The total resistance of 2 resistances, one with resistance of 2 megohm and the other of 12 megohms, in
series.
Resistances in series add, so the total resistance will be 14 megohms
c) The voltage across the 2 megohm resistor if a voltage of 70 mV is applied across these two resistances in
series.
○2 megohms12 megohms○
70 mV
The current flowing will be 70/(14 X 10
6)
milliamps.
Therefore the voltage across the 2 megohm resistor
will be 2 X 10
6
X 70/(14 X 10
6
) mV = 10 mV
d) The charge on a 2 microfarad capacitor with a voltage of 80 mV across its terminals.
Charge = 2 X 10
6
X 80 X 10
3
coulombs
= 1.6 X 10
7
coulombs
2) (20 points)
Please describe an experiment that shows that the capacitative properties of the membrane of a neuron are due
to the lipids in the membrane?
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 Fall '08
 Stretton
 Sodium, Ik, Alberts, INa

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