Question

14. Which of the following is not true regarding when a neuron is at rest?

A. it is not conducting an action potential.
B. more sodium ions (Na+) outside the cell than inside the cell.
C. more potassium ions inside the cell than outside the cell.
D. more sodium ions inside the cell than outside the cell.

Answer 1

Answer: C.

Explanation: The way the pump functions is it intakes 3 sodium ions, and spits out two potassium, so when the neuron is at rest after firing, it has to spit out all the potassium in order to intake the sodium. It will slowly intake more potassium to make up for the deficit but when at rest, the potassium concentration is higher outside the cell.