Question

You alter the sodium leak channels in a typical neuron so that they are unable to allow as many sodium ions to pass through. Which of the following would result?

(More than one correct answer. Please mark ALL CORRECT ANSWERS for full credit.)

A. The resting membrane potential would be unaffected.

B. The resting membrane potential would be farther from threshold.

C. The resting membrane potential would be closer to threshold.

D. The neuron would be completelv unable to elicit an action potential.

E. The resting membrane potential would become more positive.

F. The resting membrane potential would become more negative.

Answer 1

correct answer is B and F

Step-by-step explanation:

Correct answer is B because the inside of the axon would be much less positive than the outside of the axon due to sodium ions not being able to enter inside the axon.

Correct answer is F because as a result of sodium ions not being able to enter inside the axon and the fact that the potassium ion channels are still open, the axon becomes hyperpolarised meaning there is a very high positive charge outside the axon and a small positive charge inside the axon.

The potassium channels being open means an influx of potassium ions can still move down the electrochemical gradient and out of the axon causing the membrane potential to become even more negative.