Q. No.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
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. |
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 |
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 |
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 |
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
Myelin sheath around the axons in the PNS is secreted by:
| 1. | oligodendrocytes | 2. | axons |
| 3. | Schwann cells | 4. | ependymal |
| 1. | Medulla oblongata | 2. | Pons |
| 3. | Mid brain | 4. | Cerebellum |
The auditory tube [also called as the Eustachian tube] functions in equalizing pressure between the middle ear and:
| 1. throat | 2. inner ear |
| 3. outer ear | 4. cochlea |
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