What happens when a resting neuron's membrane depolarizes? a. There is a net diffusion of Na+ out of the cell. b. The equilibrium potential for K+(EK) becomes more positive. c. The neuron's membrane voltage becomes more positive. d. The cell's inside is more negative than the outside.

Verified step by step guidance

1. Step 1: Understand the question. The question is asking what happens when a resting neuron's membrane depolarizes. Depolarization is the process by which the membrane potential of a cell becomes less negative or more positive.
2. Step 2: Review the options. Option a suggests that there is a net diffusion of Na+ out of the cell. This is incorrect because during depolarization, Na+ ions actually rush into the cell, not out of it.
3. Step 3: Consider option b. This option suggests that the equilibrium potential for K+ (EK) becomes more positive. This is incorrect because the equilibrium potential for K+ does not change during depolarization. Instead, the membrane potential moves closer to the equilibrium potential for Na+.
4. Step 4: Look at option c. This option suggests that the neuron's membrane voltage becomes more positive. This is correct. During depolarization, the membrane potential becomes less negative (or more positive) due to the influx of Na+ ions into the cell.
5. Step 5: Finally, consider option d. This option suggests that the cell's inside is more negative than the outside. This is incorrect because during depolarization, the inside of the cell becomes less negative (or more positive) due to the influx of Na+ ions.