Q. No.The primary commissural region of the brain consisting of white matter tracts that connects the left and right cerebral hemispheres is called as:
1. corpus striatum
2. corpus luteum
3. corpus callosum
4. corpus spongiosum
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The scala vestibuli and scala tympani contain perilymph and are connected at the:
| 1. cochlear duct | 2. helicotrema |
| 3. semicircular duct | 4. vestibule |
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 |
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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 |
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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
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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 |
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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 |
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Reissner’s membrane in the inner ear separates the cochlear duct [scala media] from the:
| 1. round window | 2. scale vestibuli |
| 3. scala tympani | 4. basilar membrane |
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What is true for mechanism of hearing in humans?
1. Transmission of vibration by stapes to oval window → Waves in lymphs → Ripple in tectorial membrane → Hair cells bend against basilar membrane → Nerve impulse generated in afferent neurons
2. Transmission of vibration by malleus to oval window → Waves in lymphs → Ripple in basilar membrane → Hair cells bend against tectorial membrane → Nerve impulse generated in afferent neurons
3. Transmission of vibration by stapes to oval window → Waves in lymphs → Ripple in basilar membrane → Hair cells bend against tectorial membrane → Nerve impulse generated in afferent neurons
4. Transmission of vibration by stapes to oval window → Waves in lymphs → Ripple in basilar membrane → Hair cells bend against reisnner’s membrane → Nerve impulse generated in efferent neurons
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