- 1(current)
Q. No.What restores the resting membrane potential of the axonal membrane at the site of excitation?
1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of potassium ions
1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of potassium ions
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 57%
Level 3: 35%-60%
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The sodium potassium pump transports:
1. three sodium ions from outside to inside a cell.
2. three sodium ions from inside to outside a cell.
3. two potassium ions from outside to inside a cell.
4. both 2 and 3
1. three sodium ions from outside to inside a cell.
2. three sodium ions from inside to outside a cell.
3. two potassium ions from outside to inside a cell.
4. both 2 and 3
Subtopic: Â Action Potential |
Level 3: 35%-60%
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Depolarisation of axonal membrane is due to influx of sodium ions. |
| Statement II: | Repolarisation of axonal membrane is due to efflux of sodium ions. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 65%
Level 2: 60%+
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When neuron is resting, which of the following is false with respect to that
| 1. | It is not conducting any impulse |
| 2. | Axonal membrane is more permeable to potassium ions |
| 3. | Axonal membrane won't allow any flow of sodium ions across it |
| 4. | Membrane is impermeable to negatively charged proteins |
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 57%
Level 3: 35%-60%
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Which of the following minerals reduces the excitability of nerves and muscles?
1. Potassium
2. Sodium
3. Magnesium
4. Manganese
Subtopic: Â Action Potential |
 55%
Level 3: 35%-60%
Hints
Consider the following statements:
| I: | The resting axonal membrane is nearly impermeable to sodium ions. |
| II: | Depolarization of the axonal membrane is due to the influx of sodium ions. |
| III: | The size of the action potential, if produced, does not depend on the strength of the stimulus. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Subtopic: Â Action Potential |
Level 3: 35%-60%
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In an electrical synapse, how is the nerve impulse transmitted between neurons?
| 1. | By releasing neurotransmitters across the synaptic cleft |
| 2. | Through the direct movement of ions via gap junctions |
| 3. | By synaptic vesicles fusing with the postsynaptic membrane |
| 4. | Through saltatory conduction at the nodes of Ranvier. |
Subtopic: Â Action Potential |Â Synapse |
 54%
Level 3: 35%-60%
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With regard to neuronal signaling in the body, which of the following are true?
1. (i) only
2. (ii) only
3. (i), (ii) and (iii)
4. (i) and (ii)
| (i) | Neuronal transmission can be caused by both electrical and chemical stimulation. |
| (ii) | Synapses ultimately result in the production of an electrical current for signal transduction. |
| (iii) | All synapses in humans are electrical and unidirectional. |
2. (ii) only
3. (i), (ii) and (iii)
4. (i) and (ii)
Subtopic: Â Action Potential |
 51%
Level 3: 35%-60%
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When an action potential abruptly drops from positive to negative, this is because
| 1. | potassium gates are inactivated and sodium gates are opened. |
| 2. | sodium gates are inactivated and potassium gates are opened. |
| 3. | both potassium and sodium gates are inactivated. |
| 4. | both potassium and sodium gates are opened. |
Subtopic: Â Action Potential |
 65%
Level 2: 60%+
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As a nerve impulse passes along an axon:
1. The membrane potential changes from positive to negative and then back again
2. Sodium ions flow out through ion channels and potassium ions flow in
3. Sodium channels open as the membrane potential becomes less negative
4. The sodium-potassium pump moves sodium ions into the cell
1. The membrane potential changes from positive to negative and then back again
2. Sodium ions flow out through ion channels and potassium ions flow in
3. Sodium channels open as the membrane potential becomes less negative
4. The sodium-potassium pump moves sodium ions into the cell
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
Level 3: 35%-60%
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