XYZ
For the following questions, assume a hypothetical postsynaptic neuron has three presynaptic inputs: X, Y, and Z. Also assume that presynaptic neurons Y and Z are excitatory.
-Refer to the text.What permeability changes would be expected to occur at the postsynaptic neuron when presynaptic neuron X is stimulated (Remember that the postsynaptic neuron becomes hyperpolarized by presynaptic neuron X.)

Question

Quizplus · Accepted Answer

When presynaptic neuron X is stimulated, the postsynaptic neuron becomes hyperpolarized, which means that the permeability of the cell membrane to potassium (PK⁺) or chloride (PCl^-) ions will increase. This will lead to an efflux of K+ or influx of Cl- ions, resulting in further hyperpolarization of the cell. The other options, such as increased permeability to Na+ (PNa⁺) or Ca²⁺ (PCa²⁺), would not be expected since presynaptic neuron X causes hyperpolarization, not depolarization.

XYZ For the Following Questions, Assume a Hypothetical Postsynaptic Neuron Has