Q. No.Potential difference across resting membrane is negatively charged. This is due to differential distribution of the following ions.
1. Na+ and K+ ions
2. CO32- and Cl- ions
3. Ca2+ and Mg2+ ions
4. Ca+4 and Cl- ions
Subtopic: Origin of Resting Membrane Potential |
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Level 1: 80%+
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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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Given below are two statements:
| Assertion (A): | Membranes of neurons are in a polarised state under resting conditions |
| Reason (R): | This is due to differential distribution of Na+, K+ ions and negatively charged proteins across the axonal membranes |
| 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: Origin of Resting Membrane 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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Level 1: 80%+
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Select the incorrect statement regarding synapses:
| 1. | Impulse Transmission across a chemical synapse is always faster than that across an electrical synapse. |
| 2. | The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse. |
| 3. | Electrical current can flow directly from one neuron into the other across the electrical synapse. |
| 4. | Chemical synapses use neurotransmitters. |
Subtopic: Origin of Resting Membrane Potential | Synapse |
89%
Level 1: 80%+
NEET - 2022
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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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Which of the following factor is responsible for resting membrane potential?
| 1. | More permeability of membrane for Na+ |
| 2. | More permeability of membrane for K+ |
| 3. | Presence of negatively charged protein molecule outside the neuron |
| 4. | Presence of positively charged protein molecule on inner side of the neuron |
Subtopic: Origin of Resting Membrane Potential |
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Level 1: 80%+
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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 |
83%
Level 1: 80%+
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