For a neuron with an initial membrane potential at -70 mV, an increase in the movement of potassium ions out of that neuron's cytoplasm would result in the
A) depolarization of the neuron.
B) hyperpolarization of the neuron.
C) replacement of potassium ions with sodium ions.
D) replacement of potassium ions with calcium ions.
E) neuron switching on its sodium-potassium pump to restore the initial conditions.

Question

Quizplus · Accepted Answer

An increase in the movement of potassium ions out of the neuron's cytoplasm would result in an increase in the negative charge inside the neuron, leading to hyperpolarization (more negative than the resting potential of -70 mV). This is because potassium ions carry a positive charge and their movement out of the neuron would leave behind a negative charge.

For a Neuron with an Initial Membrane Potential at -70