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Q. No.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 |
81%
From NCERT
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Nodes of Ranvier are best described as:
1. Synaptic knobs at axonal endings
2. Gaps in myelin sheath
3. The broad part of cell body from where axon arises
4. Points of electrical synapses
1. Synaptic knobs at axonal endings
2. Gaps in myelin sheath
3. The broad part of cell body from where axon arises
4. Points of electrical synapses
Subtopic: Neuroanatomy |
From NCERT
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Nodes of Ranvier primarily function in:
| 1. | Enhancing neuronal metabolism |
| 2. | Stopping progress of nerve impulse |
| 3. | Speeding up transmission of nerve impulse by saltatory condition |
| 4. | Preventing neuronal damage |
Subtopic: Neuroanatomy |
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Medulla oblongata:
| I: | is a part of the brain stem |
| II: | is a part of the hind brain |
| III: | is a part of the limbic system |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Subtopic: Neuroanatomy | Hind & Mid Brain |
83%
From NCERT
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Q. No.
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