Q. No.Each time the sodium-potassium pump functions, it actively transports:
| 1. | three sodium ions to the outside and two potassium ions to the inside of a cell. |
| 2. | two sodium ions to the outside and three potassium ions to the inside of a cell. |
| 3. | three sodium ions to the outside and two hydrogen ions to the inside of a cell. |
| 4. | three potassium ions to the outside and two hydrogen ions to the inside of a cell. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
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Level 1: 80%+
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The unique characteristic of an electrical synapse, making it distinct from a chemical synapse, is that:
| 1. | It requires neurotransmitters to transmit impulses between neurons. |
| 2. | It uses synaptic vesicles to transmit impulses between neurons. |
| 3. | It occurs predominantly in the autonomic neural system. |
| 4. | It allows direct current flow between neurons with only a virtual synaptic cleft, resulting in faster impulse transmission. |
Subtopic: Origin of Resting Membrane Potential | Action Potential | Synapse |
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In the following diagram showing axon terminal and synapse A, B, C, D and E respectively represents:
| 1. | A-axon terminal, B-synaptic cleft, G-synaptic vesicles, D-neurotransmitters, E-receptors |
| 2. | A-axon terminal, B-synaptic vesicles, C-synaptic cleft, D-receptors, E-neurotransmitters |
| 3. | A-synaptic cleft, B-synaptic vesicles, C-axon terminal, D-neurotransmitters, E-receptors |
| 4. | A-synaptic cleft, B-axon terminal, C-synaptic vesicles, D-neurotransmitters, E-receptors |
Subtopic: Action Potential | Synapse |
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A diagram showing axon terminal and synapse is given. Identify correctly A-D:
| 1. | A | Receptor | C | Synaptic vesicles |
| 2. | B | Synaptic connection | D | K+ |
| 3. | A | Neurotransmitter | B | Synaptic cleft |
| 4. | C | Neurotransmitter | D | Ca2+ |
Subtopic: Action Potential | Synapse |
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The axoplasm inside the axon contains:
| 1. | low concentration of K+ |
| 2. | high concentration of negatively charged proteins |
| 3. | high concentration of Na+ |
| 4. | equal concentrations of Na+ and K+ |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
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Depolarisation of neural membranes is caused due to
1. Rapid influx of Na+ ions
2. Rapid influx of K+ ions
3. Rapid efflux of Na+ ions
4. Rapid influx of Cl- ions
1. Rapid influx of Na+ ions
2. Rapid influx of K+ ions
3. Rapid efflux of Na+ ions
4. Rapid influx of Cl- ions
Subtopic: Origin of Resting Membrane Potential | Action Potential |
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The resting axonal membrane is:
| 1. | impermeable to the flux of both sodium and potassium ions |
| 2. | freely permeable to the flux of both sodium and potassium ions |
| 3. | relatively more permeable to the flux of potassium and nearly impermeable to the flux of sodium ions |
| 4. | relatively more permeable to the flux of sodium and nearly impermeable to the flux of potassium ions |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
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Consider the given two statements:
| Assertion (A): | During the depolarization phase of a nerve impulse, the inside of the neuron becomes positive compared to the outside. |
| Reason (R): | Depolarization occurs due to the influx of sodium ions (Na+) into the neuron through sodium channels. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Action Potential |
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| Assertion (A): | Electrical synapses are common in our nervous system. |
| Reason (R): | Electrical synapses allow slower impulse transmission than chemical synapses. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Nervous System | Origin of Resting Membrane Potential | Action Potential | Synapse |
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Which of the following statements is/are true?
| I: | The resting axonal membrane is relatively more permeable to potassium ions and nearly impermeable to sodium ions. |
| II: | Sodium-potassium pump transports 3 Na+ outwards for 2 K+ into the cell. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
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