1. | Dura mater | 2. | Arachnoid mater |
3. | Pia mater | 4. | Grey mater |
I: | The PNS is divided into two divisions called somatic neural system and autonomic neural system. |
II: | The somatic neural system relays impulses from the CNS to skeletal muscles while the autonomic neural system transmits impulses from the CNS to the involuntary organs and smooth muscles of the body. |
III: | The autonomic neural system is further classified into sympathetic neural system and parasympathetic neural system. |
IV: | Visceral nervous system is the part of the peripheral nervous system that comprises the whole complex of nerves, fibres, ganglia, and plexuses by which impulses travel from the central nervous system to the viscera and from the viscera to the central nervous system. |
Consider the given two statements
Assertion (A): | Myelinated neurons conduct impulse at a higher rate than the unmyelinated neurons. |
Reason (R): | Myelinated neurons have saltatory conduction of impulse. |
1. | Both (A) and (R) are True and (R) correctly explains (A). |
2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
3. | (A) is True, (R) is False. |
4. | (A) is False, (R) is False. |
I: | Myelinated nerve fibres |
II: | Unmyelinated nerve fibres |
I: | Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. |
II: | Unmyelinated nerve fibre is not enclosed by a Schwann cell or a myelin sheath. |
III: | Myelinated nerve fibres are found in spinal and cranial nerves. |
IV: | Unmyelinated nerve fibres are commonly found in autonomous and somatic neural systems. |
1. | Only II is incorrect | 2. | I and II are correct |
3. | III and IV are incorrect | 4. | All are correct |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
Assertion (A): | Neurons are excitable cells. |
Reason (R): | The membrane of neurons is polarised. |
1. | Both (A) and (R) are True and (R) correctly explains the (A). |
2. | Both (A) and (R) are True but (R) does not correctly explain the (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Statement I: | Sensory nerves consist of nerve fibers that conduct impulses toward the central nervous system (CNS). |
Statement II: | Motor nerves consist of nerve fibers that conduct impulses away from the CNS. |
Column I | Column II | ||
A | Sensory neurons | P | carry signals from the CNS to effectors (muscles or glands) |
B | Motor neurons | Q | connect sensory and motor neurons |
C | Interneurons | R | transmit signals from sensory receptors to the central nervous system |
A | B | C | |
1. | P | Q | R |
2. | Q | P | R |
3. | R | P | Q |
4. | R | Q | P |