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Q. No.The nerve fibres of the peripheral nervous system (PNS) are of two types:
I:
Afferent nerve fibres transmit impulses from tissues/organs to the central nervous system (CNS)
II:
Efferent fibres transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs
1.
Only I is correct
2.
Only II is correct
3.
Both I and II are correct
4.
Both I and II are incorrect
Subtopic: Nervous System |
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There are two types of axons, namely, myelinated and non-myelinated. Find out the correct statement:
| I: | The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. |
| II: | Myelinated nerve fibres are found in spinal and cranial nerves. |
| III: | Unmyelinated nerve fibres are not enclosed by a Schwann cell and a myelin sheath around the axon. |
| IV: | Unmyelinated nerve fibres are commonly found in autonomous and the somatic neural systems. |
| 1. | I, II, IV only | 2. | III and IV only |
| 3. | I, II, III and IV | 4. | None, All are incorrect |
Subtopic: Nervous System | Neuroanatomy |
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Different types of ion channels are present on the neural membrane. When a neuron is not conducting any 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
| I: | the axonal membrane is comparatively more permeable to potassium ions and nearly impermeable to sodium ions. |
| II: | the axonal membrane has an excess of negative charge on the outside and an excess of positive charge just on the inside of the membrane. |
| III: | the axonal membrane is impermeable to negatively charged proteins present in the axoplasm. |
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: Action Potential |
86%
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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 |
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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 |
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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 |
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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 |
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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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