If neuron X causes hyperpolarization of neuron Z but neuron Y causes depolarization of neuron Z, what change would you expect in neuron Z if it is stimulated by both X and Y simultaneously?
A)a significant increase in membrane potential
B)a significant decrease in membrane potential
C)temporal summation leading to an impulse on Z
D)simultaneous influx and efflux of cations or simultaneous influx of cations and efflux of anions
E)an increase in the resting membrane potential

Question

Quizplus · Accepted Answer

If neuron X causes hyperpolarization of neuron Z, it means that neuron X is inhibitory and the efflux of negatively charged ions cause the membrane potential of neuron Z to decrease. On the other hand, neuron Y causes depolarization of neuron Z, which means that neuron Y is excitatory and causes the influx of positively charged ions into neuron Z, thereby increasing the membrane potential of neuron Z. When neuron Z is stimulated by both X and Y simultaneously, you would expect simultaneous influx and efflux of cations or simultaneous influx of cations and efflux of anions because the net effect of these opposing inputs would be dependent on the relative strengths of X and Y.

If Neuron X Causes Hyperpolarization of Neuron Z but Neuron