Q. No.Read all statements carefully and identify the number of correct ones:
(a) Neural system provides an organised network of point-to-point connections for quick coordination.
(b) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.
(c) Cerebral aqueduct passes through the midbrain.
(d) The hypothalamus contains centers that control respiration and gastric secretions.
1. One
2. Two
3. Three
4. Four
Read the following statement carefully and choose how many of them are incorrect
a. Afferent neuron transmits signal of CNS.
b. The choroid layer is bluish color and is present over the posterior two-thirds of the eyeball.
c. Olfactory bulbs are an extension of the hypothalamus
d. Medulla oblongata have centre to control excretion, circulation, and gastric secretion.
1. One
2. Two
3. Three
4. Four
Which of the following statement is correct for the node of Ranvier of nerve:
1. Neurilemma is discontinuous
2. Myelin sheath is discontinuous
3. Both neurilemma & Myelin sheath are discontinuous
4. Covered by myelin sheath
In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive:
1. K+ and Na+ out of the cell
2. Na+ into the cell
3. Na+ out of the cell
4. K+ into the cell
During the transmission of nerve impulses through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?
| 1. | First negative, then positive, and again back to negative |
| 2. | First positive, then negative, and continue to be negative |
| 3. | First negative, then positive, and then continues to be positive |
| 4. | First positive, then negative, and again back to positive |
| 1. | equally permeable to both Na+ and K+ ions |
| 2. | impermeable to both Na+ and K+ ions |
| 3. | comparatively more permeable to K+ ions and nearly impermeable to Na+ ions |
| 4. | comparatively more permeable to Na+ ions and nearly impermeable to K+ ions |
Resting membrane potential is maintained by
1. hormones
2. neurotransmitters
3. ion pumps
4. None of these
Potential difference across resting membrane is negatively charged. This is due to differential distribution of the following ions.
1. Na+ and K+ ions
2. CO32- and Cl- ions
3. Ca2+ and Mg2+ ions
4. Ca+4 and Cl- ions
| List-I | List-II | ||
| (a) | Multipolar neuron | (i) | Somatic neural system |
| (b) | Bipolar neuron | (ii) | Cerebral cortex |
| (c) | Myelinated nerve fibre | (iii) | Retina of Eye |
| (d) | Unmyelinated nerve fibre | (iv) | Spinal nerves |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (iv) | (ii) |
| 2. | (ii) | (iv) | (iii) | (i) |
| 3. | (ii) | (iii) | (i) | (iv) |
| 4. | (ii) | (iii) | (iv) | (i) |
Myelin sheath is produced by:
| 1. | Astrocytes and Schwann cells |
| 2. | Oligodendrocytes and Osteoclasts |
| 3. | Osteoclasts and Astrocytes |
| 4. | Schwann cells and Oligodendrocytes |
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