If neuron X causes hyperpolarization, then what does it cause in a postsynaptic neuron?
A)Increased PNa+ and PK+
B)Increased PK+ or PCl-
C)Increased influx of protein anions
D)Increased permeability to calcium ions
E)Either b or c

Question

Quizplus · Accepted Answer

Hyperpolarization refers to the increase in membrane potential i.e. becoming more negative. This may occur due to an influx of anions, such as Cl-, or an efflux of cations, such as K+. Therefore, option B is the most appropriate choice as it suggests an increase in permeability to either K+ or Cl-. Option C is incorrect as there is no mechanism for the influx of protein anions into a postsynaptic neuron. Option A and D are also incorrect as hyperpolarization would not lead to an increased permeability of ions such as Na+ or Ca2+.

If Neuron X Causes Hyperpolarization, Then What Does It Cause