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. |
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1. Resting potential | 2. Action potential |
3. Threshold potential | 4. Reversal potential |
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. |
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1. Cerebrum | 2. Thalamus |
3. Hypothalamus | 4. Cerebellum |
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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 are correct | 2. Both are incorrect |
3. Only I is correct | 4. Only II is correct |
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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 |
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Identify the correct statements regarding the events A and B in the given diagram:
I: | A is depolarization and is caused by the influx of sodium ions. |
II: | B is repolarization and is caused by the efflux of potassium ions. |
A | B | C | D | |
1. | I | II | III | IV |
2. | II | V | I | III |
3. | I | III | II | IV |
4. | III | IV | II | I |
I: | The action potential, generated due to the depolarization of the axonal membrane, arrives at the axon terminal. |
II: | Potassium ions enter the synaptic knob. |
III: | Synaptic vesicles are activated and release neurotransmitter in the synaptic cleft. |
IV: | Neurotransmitter binds to the receptor on the post-synaptic membrane. |
A: | Frontal lobe | Planning, reasoning and problem solving |
B: | Parietal lobe | Integrating sensory information, including touch, temperature, pressure and pain |
C: | Occipital lobe | Location of the primary visual cortex which receives visual information from the eyes |
D: | Temporal lobe | Contains the primary auditory cortex, which receives auditory information from the ears |
1. | Only A and B | 2. | Only A, B and C |
3. | Only B, C and D | 4. | A, B, C and D |