The resting axonal membrane is impermeable/nearly impermeable to:
I. Sodium ions
II. Potassium ions
III. Negatively charged proteins

When a neuron is resting, the axonal membrane is relatively more permeable to potassium ions and nearly impermeable to sodium ions. This would mean that:

1. in resting conditions, all sodium channels in the axonal membrane are closed while few potassium channels are open

2. in resting conditions, the electrogenic sodium-potassium pump will pump only the sodium ions

3. in resting conditions, the electrogenic sodium-potassium pump will pump only the potassium ions

4. in resting conditions, the outer surface of the axonal membrane will carry a negative charge

During the propagation of a nerve impulse, the action potential results from the movement of

1. Na⁺ ions from extracellular fluid to intracellular fluid.
2. K⁺ ions from extracellular fluid to intracellular fluid.
3. Na⁺ ions from intracellular fluid to extracellular fluid.
4. K⁺ ions from intracellular fluid to extracellular fluid.                         

The change in membrane potential that returns it to a negative value just after an action potential has changed the membrane potential to a positive value is called as:

All the following statements with respect to the propagation of action potentials are correct except:
1. Saltatory conduction occurs in myelinated nerve fibers
2. During conduction of an action potential, current flows from the active area of the membrane to the adjacent inactive area, thereby decreasing the potential in the inactive area to the threshold
3. Action potential propagation is faster in myelinated fibers than in unmyelinated ones
4. Action potential propagation is faster for strong stimuli than for weaker stimuli

The relatively static membrane potential of quiescent cells is called the:

The resting membrane potential is first established because of:
1. the movement of potassium ions down their electrical gradient through leak channels
2. the opening of voltage-gated sodium channels
3. the action of the Na+/K+ ATPase pump which transports positive ions in unequal numbers
4. the movement of sodium ions against their concentration gradient through leak channels

In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive
1. K⁺ and Na⁺ out of the cell.
2. Na⁺ into the cell.
3. Na⁺ out of the cell.
4. K⁺ into the cell.