Sodium potassium pump in neuronal membranes is

The resting axonal membrane of a neuron:

1. is not polarized

2. has an excess of anions on the outside

3. is more permeable to potassium ions than to sodium ions

4. cannot be excited by a stimulus

During the process of impulse conduction, the depolarisation of axon takes place because

1. Voltage gated ${\mathrm{K}}^{+}$ channels open

2. Equal amounts of ${\mathrm{Na}}^{+}$ and ${\mathrm{K}}^{+}$ are pumped out

3. Voltage gated ${\mathrm{Na}}^{+}$ channels open

4. Equal amounts of ${\mathrm{Na}}^{+}$ and K are pumped in

Nerve impulse travelling through synapses cannot be

Which of the following event can be related to the repolarisation of nerve fiber?

1. Opening up of K⁺ gated channel

2. Opening up of Cl^- gated channel

3. Closure of Na⁺ gated channel

4. Both 1 & 3

Depolarization of axolemma during nerve conduction takes place because of:
 

The "sodium-potassium pump" pumps ______.
1. sodium ions out and potassium ions in
2. sodium ions in and potassium ions out
3. sodium and potassium ions in
4. sodium and potassium ions out

Match each item in Column I with one item in Column II and choose your answer from the codes given below:

Codes :

The depolarization of the axonal membrane is due to:

1. Influx of sodium ions

2. Efflux of sodium ions

3. Influx of potassium ions

4. Efflux of the potassium ions

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

1. K⁺ ions from extracelular fluid to intracellular fluid

2. Na⁺ ions from intracellular fluid to extracellular fluid

3. K⁺ ions from intracellular fluid to extracellular fluid

4. Na⁺ ions from extracellular fluid to intracellular fluid