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Q. No.Which of the following minerals reduces the excitability of nerves and muscles?
1. Potassium
2. Sodium
3. Magnesium
4. Manganese
Subtopic: Action Potential |
55%
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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: Action Potential |
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A major coordinating center for sensory and motor signaling in the human brain is shown in the given sagittal section by the letter:
1. A
2. B
3. C
4. D
Subtopic: Diencephalon |
56%
From NCERT
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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: Origin of Resting Membrane Potential | Action Potential |
57%
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Which of the following regions of the brain is incorrectly paired with its function?
| 1. | Medulla oblongata-Homeostatic control |
| 2. | Cerebellum-Language comprehension |
| 3. | Corpus callosum-Communication between the left and right cerebral cortices |
| 4. | Cerebrum-Calculation and contemplation |
Subtopic: Hind & Mid Brain |
From NCERT
NEET - 2015
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Identify the correct statement regarding the sections of the spinal cord shown in the given diagram:
| I: | A and D are part of the grey mater |
| II: | B is motor and C is sensory |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Nervous System |
54%
From NCERT
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | In a neuron, Nissl’s granules are present in dendrites as well as cell body |
| II: | Unmyelinated neurons in peripheral neural system are not enclosed by a Schwann cell |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Nervous System |
64%
From NCERT
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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: Origin of Resting Membrane Potential | Action Potential |
55%
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Dysfunction of which of the following parts of the human brain is most likely to affect learning and memory?
1. Pons
2. Hippocampus
3. Cerebellum
4. Hypothalamus
1. Pons
2. Hippocampus
3. Cerebellum
4. Hypothalamus
Subtopic: Diencephalon |
55%
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What restores the resting potential of the membrane at the site of excitation?
1. Influx of sodium ions
2. Influx of potassium ions
3. Efflux of sodium ions
4. Efflux of potassium ions
1. Influx of sodium ions
2. Influx of potassium ions
3. Efflux of sodium ions
4. Efflux of potassium ions
Subtopic: Action Potential |
58%
From NCERT
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