Researchers Are Looking into How Stimulation with Neurotransmitters Affects the Membrane

question 190

Multiple Choice

Researchers are looking into how stimulation with neurotransmitters affects the membrane potential of postsynaptic neurons. Baseline experiments show that high membrane permeability for a certain ion generates the resting membrane potential. In response to the onset of neurotransmitter stimulation, ligand-gated ion channels open (black arrow) and enhance the membrane's permeability for an alternative ion, altering the membrane potential. This causes voltage-gated ion channels (red arrow) to open slowly, increasing the permeability of the membrane for a third kind of ion. The graph below displays the experiment's findings. 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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