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Q. No.The ionic gradients across the resting axonal membrane are maintained by:
1.
the passive transport of sodium and potassium ions through membrane channels.
2.
the passive transport of sodium and chloride ions through membrane channels.
3.
the active transport of ions by the sodium-potassium pump which transports 3 Na+ outwards for 2 K+ into the cell.
4.
the active transport of ions by the sodium-chloride pump which transports 3 Na+ outwards for 2 Cl- into the cell.
Subtopic: Action Potential |
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When a stimulus of adequate strength is applied at a site on the polarised membrane, the membrane at that site becomes:
1. freely permeable to Na+.
2. freely permeable to K+.
3. impermeable to Na+.
4. impermeable to K+.
1. freely permeable to Na+.
2. freely permeable to K+.
3. impermeable to Na+.
4. impermeable to K+.
Subtopic: Origin of Resting Membrane Potential | Action Potential |
89%
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At a chemical synapse:
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: | neurotransmitters are involved in the transmission of impulses. |
| II: | the axon terminals contain vesicles filled with the neurotransmitters. |
| III: | the released neurotransmitters bind to their specific receptors, present on the post-synaptic membrane. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Action Potential | Synapse |
94%
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The human forebrain consists of all the following except:
| 1. | cerebrum | 2. | thalamus |
| 3. | hypothalamus | 4. | cerebellum |
Subtopic: Hind & Mid Brain | Fore Brain |
96%
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Consider the two statements:
| Assertion (A): | The cerebral cortex is referred to as the grey matter. |
| Reason (R): | Myelin sheaths around the axons give the cerebral cortex a grey appearance. |
| 1. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Fore Brain |
69%
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The cerebrum wraps around a structure called thalamus, which is:
| 1. | the highest set of regulation of the functions in human body. |
| 2. | a major coordinating centre for sensory and motor signaling. |
| 3. | involved in decoding the sense of olfaction. |
| 4. | vestigial in human beings. |
Subtopic: Fore Brain |
92%
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The hypothalamus:
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: | is a part of the rhombencephalon. |
| II: | contains a number of centres which control body temperature, urge for eating and drinking. |
| III: | contains several groups of neurosecretory cells, which secrete hormones called hypothalamic hormones. |
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: Fore Brain |
82%
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Limbic system is involved in the regulation of sexual behaviour, expression of emotional reactions (e.g., excitement, pleasure, rage and fear), and motivation primarily along with:
1. cerebrum
2. hypothalamus
3. thalamus
4. mid brain
1. cerebrum
2. hypothalamus
3. thalamus
4. mid brain
Subtopic: Fore Brain |
92%
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The midbrain:
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: | is located between the thalamus/hypothalamus of the forebrain and pons of the hindbrain. |
| II: | is the part of the brain traversed by the cerebral aqueduct. |
| III: | consists mainly of four round swellings (lobes) called corpora cavernosa. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Hind & Mid Brain |
79%
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Which part of the human hindbrain consists of fibre tracts that interconnect different regions of the brain?
1. pons
2. cerebellum
3. medulla oblongata
4. corpora quadrigemina
1. pons
2. cerebellum
3. medulla oblongata
4. corpora quadrigemina
Subtopic: Hind & Mid Brain |
74%
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