Column I | Column II |
A. Peripheral neural system | P. Comprises of all nerves associated with brain and spinal cord |
B. Somatic neural system | Q. Relays impulses from CNS to skeletal muscles |
C. Visceral neural system | R. Transmits impulse from CNS to involuntary organs and smooth muscles |
D. Autonomic neural system | S. Part of PNS where impulses travel from CNS to the viscera and from the viscera to the CNS |
A | B | C | D | |
1. | P | Q | R | S |
2. | Q | R | S | P |
3. | R | S | P | Q |
4. | S | P | Q | R |
1. CNS | 2. Somatic neural system |
3. Autonomic neural system | 4. Visceral neural system |
I. Cell body | II. Dendrites | III. Axon |
1. I and II only | 2. I and III only |
3. II and III only | 4. I, II and III |
Column I | Column II | ||
A. | Multipolar neuron | P. | Embryonic stage |
B. | Bipolar neuron | Q. | Retina |
C. | Unipolar neuron | R. | Cerebral cortex |
A | B | C | |
1. | P | Q | R |
2. | Q | R | P |
3. | R | Q | P |
4. | R | P | Q |
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: | 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 |
Assertion (A): | Neurons are excitable cells. |
Reason (R): | Their membranes are in a polarised state. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
1. | is comparatively more permeable to sodium ions and nearly impermeable to potassium ions. |
2. | is freely permeable to sodium ions and potassium ions. |
3. | is impermeable to sodium ions and potassium ions. |
4. | is comparatively more permeable to potassium ions and nearly impermeable to sodium ions. |
The resting axonal membrane is impermeable to:
I: Sodium ions
II: Potassium ions
III: Negatively charges proteins present in the axoplasm
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II and III |
1. | 3 sodium ions outwards and 2 potassium ions into the cell. |
2. | 3 sodium ions into the cells and 2 potassium outwards. |
3. | 2 sodium ions outwards and 3 potassium ions into the cell. |
4. | 2 sodium ions into the cells and 3 potassium ions outwards. |