Neuron A is a healthy neuron with all the usual ion channels. When at rest with a membrane voltage of R millivolts, neuron A produces no action potentials.
The voltage threshold for an action potential in neuron A is T millivolts. T is greater than R; T is less than zero. In addition, neuron A's membrane includes the membrane-spanning molecule Z with an ion channel that opens when neurotransmitter Y binds to the Y receptor site on the extracellular surface of Z. The Nernst equilibrium potential for Z's ion channel is E millivolts. Neuron B synapses on neuron A; neuron B's neurotransmitter is neurotransmitter Y. Which of the following statements are true when neuron A is initially at rest and neuron B releases neurotransmitter Y?
A. If the value of E is less than R and if potassium is the only ion that passes through open Z channels, then Y's binding to its receptor site on Z in neuron A produces a decrease in the membrane voltage of neuron A, an increase in the amount of intracellular potassium ions in neuron A, and an inhibitory postsynaptic potential in neuron A
B. If the value of E is zero and if both sodium ions and potassium ions pass through open Z channels, then Y's binding to its receptor site on Z in neuron A produces an increase the membrane voltage of neuron A, an increase in the amount of intracellular potassium ions in neuron A, and an excitatory postsynaptic potential in neuron A.
C. If the value of E is greater than R and less than T, and if chloride is the only ion that passes through open Z channels, then Y's binding to its receptor site on Z in neuron A produces an increase the membrane voltage of neuron A, a decrease in the amount of intracellular chloride ions in neuron A, and an inhibitory postsynaptic potential in neuron A.