Researchers Are Studying How the Membrane Potential of a Postsynaptic

question 123

Multiple Choice

Researchers are studying how the membrane potential of a postsynaptic neuron changes in response to neurotransmitter stimulation.  Baseline measurements determine that the resting membrane potential is generated by high membrane permeability for a particular ion.  When neurotransmitter stimulation begins, ligand-gated ion channels open (black arrow) and increase the membrane permeability for a different ion, causing a change in membrane potential.  This triggers the delayed opening of voltage-gated ion channels (red arrow) , which increase the membrane permeability for a third type of ion.  The results of the experiment are shown in the graph below. The equilibrium potentials of different ions under physiologic conditions are as follows: Which of the following options would best explain the changes in this neuron's membrane potential during the experiment?

• A)A
• B)B
• C)C
• D)D

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