SAT Subject Biology Practice Question 160: Answer and Explanation
10. How will the function of a neuron be affected if the potassium channels of the membrane remain open?
A. It will continue to function normally.
B. It will function inconsistently.
C. It will no longer function due to sodium leakage.
D. It will continue to function but not transmit any impulses.
E. It will no longer function due to an overly positive charge.
Correct Answer: A
A neuron contains both sodium and potassium ion channels. Potassium ion channels are referred to as "leak channels" because they are always open, under which condition the neuron continues to function normally.