Q. No.Myelin sheath around the axons in the PNS is secreted by:
1. oligodendrocytes
2. axons
3. Schwann cells
4. ependymal
What causes the movement of the synaptic vesicles towards the membrane during transmission of impulse across a chemical synapse?
| 1. Sodium | 2. Calcium |
| 3. cAMP | 4. cGMP |
Match each item in Column I [part of the brain] with one in Column II [function] and select the answer from the codes given below:
|
|
Column I |
|
Column II |
|
A. |
Amygdala |
a. |
Relays motor and sensory signals to the cerebral cortex |
|
B. |
Hippocampus |
b. |
Reflex centers involving vision and hearing |
|
C. |
Thalamus |
c. |
Plays a key role in the processing of emotions |
|
D. |
Corpora quadrigemina |
d. |
Formation of new memories and is also associated with learning and emotions |
Codes
| A | B | C | D | |
| 1. | c | d | b | a |
| 2. | d | c | a | b |
| 3. | c | d | a | b |
| 4. | d | c | b | a |
The change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals is called as:
1. Action potential
2. Threshold potential
3. Reversal potential
4. Excitatory post synaptic potential
Match each item in Column I [part of the brain] with one in Column II [function] and select the answer from the codes given below:
|
|
Column I |
|
Column II |
|
A. |
Medulla oblongata |
a. |
Motor control |
|
B. |
Pons varoli |
b. |
Hunger center |
|
C. |
Cerebellum |
c. |
Bridge between cerebellum and rest of brain |
|
D. |
Hypothalamus |
d. |
Gastric secretions, respiratory rhythm center |
Codes
| A | B | C | D | |
| 1. | c | d | b | a |
| 2. | d | c | a | b |
| 3. | c | d | a | b |
| 4. | d | c | b | a |
The cranial meninge that is in contact with the brain tissue is the:
| 1. Dura mater | 2. Arachanoid mater |
| 3. Pia mater | 4. Grey matter |
A canal called the cerebral aqueduct passes through the:
| 1. Cerebral hemispheres | 2. Diencephalon |
| 3. Mid brain | 4. Hind brain |
Most of the neurons in the cerebral cortex are:
| 1. | Unipolar | 2. | Bipolar |
| 3. | Multipolar | 4. | Pseudounipolar |
The re-establishment of the resting membrane potential after depolarization is primarily due to:
| 1. Sodium potassium pump | 2. Influx of sodium |
| 3. Efflux of potassium | 4. Efflux of sodium |
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.
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