Q. No.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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Myelin sheath around the axons in the PNS is secreted by:
| 1. oligodendrocytes | 2. axons |
| 3. Schwann cells | 4. ependymal |
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The brain stem includes all the following except:
| 1. Medulla oblongata | 2. Pons |
| 3. Mid brain | 4. Cerebellum |
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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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In the given diagram of olfactory membrane, identify the olfactory receptor cell:
| 1. A | 2. B |
| 3. C | 4. D |
When one enters a dark room from a bright area:
1. retinol is converted to rhodopsin and eye sensitivity is decreased
2. rhodopsin is converted to retinol and eye sensitivity is decreased
3. rhodopsin is converted to retinol and eye sensitivity is increased
4. retinol is converted to rhodopsin and eye sensitivity is increased
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