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Q. No.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A):
Neurons are excitable cells.
Reason (R):
Their membranes are in a polarised state.
In the light of the above statements choose the correct answer from the options given below:
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.
(A) is False but (R) is True.
Subtopic: Origin of Resting Membrane Potential | Action Potential |
87%
Level 1: 80%+
Hints
When the neuron is not conducting any impulse, i.e., resting, the axonal membrane:
| 1. | is comparatively more permeable to sodium ions and nearly impermeable to potassium ions. |
| 2. | is freely permeable to sodium ions and potassium ions. |
| 3. | is impermeable to sodium ions and potassium ions. |
| 4. | is comparatively more permeable to potassium ions and nearly impermeable to sodium ions. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
88%
Level 1: 80%+
Hints
The resting axonal membrane is impermeable to:
I: Sodium ions
II: Potassium ions
III: Negatively charges proteins present in the axoplasm
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
84%
Level 1: 80%+
Hints
Each time the sodium-potassium pump functions, it actively transports:
| 1. | 3 sodium ions outwards and 2 potassium ions into the cell. |
| 2. | 3 sodium ions into the cells and 2 potassium outwards. |
| 3. | 2 sodium ions outwards and 3 potassium ions into the cell. |
| 4. | 2 sodium ions into the cells and 3 potassium ions outwards. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
87%
Level 1: 80%+
Hints
In a resting axonal membrane:
| 1. | The outer surface possesses a positive charge while its inner surface becomes negatively charged. |
| 2. | The outer surface possesses a negative charge while its inner surface becomes positively charged. |
| 3. | Both the outer and the inner surface are positively charged. |
| 4. | Both the outer and the inner surface are negatively charged. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
91%
Level 1: 80%+
Hints
The electrical potential difference across the resting axonal membrane is called as the:
| 1. Resting potential | 2. Action potential |
| 3. Threshold potential | 4. Reversal potential |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
85%
Level 1: 80%+
Hints
Consider the given statements:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | When a stimulus is applied at a site on the polarised axonal membrane, the membrane at that site becomes freely permeable to sodium ions. |
| II: | A rapid influx of sodium at this point leads to reversal of polarity and the membrane at the site is said to be depolarised. |
| III: | The electric potential difference at the site is called the action potential which is in fact termed as nerve impulse. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Origin of Resting Membrane Potential | Action Potential |
86%
Level 1: 80%+
Hints
Subtopic: Hind & Mid Brain |
95%
Level 1: 80%+
Hints
Consider the given two statements:
| I: | The cerebral cortex, referred to as the grey matter, is thrown into prominent folds. |
| II: | The cerebral white mater contains motor areas, and association area. |
| 1. | Both I and II are correct | 2. | Both I and II incorrect |
| 3. | Only I is correct | 4. | Only II is correct |
Subtopic: Diencephalon |
52%
Level 3: 35%-60%
Hints
Consider the given two statements:
| I: | The association areas of the cerebral cortex are neither clearly sensory nor motor in function. |
| II: | The association areas are responsible for complex functions like intersensory associations, memory and communication. |
| 1. | Both are correct | 2. | Both are incorrect |
| 3. | Only I is correct | 4. | Only II is correct |
Subtopic: Diencephalon |
90%
Level 1: 80%+
Hints
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