sample_midterm_3_2007

sample_midterm_3_2007 - Question 1(10 points Circle true or...

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Question 1 (10 points) Circle true or false. 1. ATP hydrolysis is used to propagate the action potential. (True/ False) 2. Hyperpolarization can cause an action potential. (True/ False) 3. Removing extracellular calcium prevents the generation of an action potential. (True/ False) 4. Chemical synapses are faster and more common than electrical synapses (True/ False) 5. Astrocytes can myelinate more than one axon. (True/ False) Question 2 (26 points) You have set up an experimental system where you can record from a neuron that receives inputs from four other neurons as shown below. You have determined the ion concentrations inside and outside the cell. Inside the cell there is 10mM Na+, 10mM Cl-, and 100mM K+. Outside the cell there is 100mM Na+, 100mM Cl-, and 10mM K+. The resting potential for this neuron is –58mV and the threshold potential for this neuron is –40mV. LOGARITHMS CHEAT SHEET: Log(1000) = 3, Log(100) = 2, Log (10) = 1, Log (1) = 0, Log (0.1 ) = -1, Log (0.01 = -2, Log (0.001) = -3 GO ON TO NEXT PAGE! 1 2 3 4
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Your first experiment is to identify the type of neurotransmitter used at each synapse. To do this you stimulate each presynaptic neuron and measure the reversal potential at each synapse. 2a. (2 points) What is the definition of reversal potential? 2b. (2 points) How does one experimentally determine reversal potential? You find that the reversal potential for both synapses 1 and 3 is 0mV. For 2 it is –60mV and for 4 it is –10mV. 2c. (2 points) Which ion or combination(s) of ions could be responsible for the currents generated from stimulation of synapse 1? 2d. (2 points) Which ion or combination(s) of ions could be responsible for the currents generated from stimulation of synapse 2? 2e. (4 points) Which of the 4 synapses are excitatory, and which are inhibitory? The next experiment you do is to measure the post-synaptic membrane potential after
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This note was uploaded on 05/02/2008 for the course NPB 100 taught by Professor Chapman during the Spring '08 term at UC Davis.

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sample_midterm_3_2007 - Question 1(10 points Circle true or...

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