Q. No.The resting axonal membrane is:
1.
impermeable to the flux of both sodium and potassium ions
2.
freely permeable to the flux of both sodium and potassium ions
3.
relatively more permeable to the flux of potassium and nearly impermeable to the flux of sodium ions
4.
relatively more permeable to the flux of sodium and nearly impermeable to the flux of potassium ions
Most sensory receptors function by producing depolarising potentials. Which of the following function by hyperpolarization rather than depolarization?
1. proprioceptors
2. nociceptors
3. olfactory receptors
4. rods and cones
Each time the sodium-potassium pump works, it transports:
1. three sodium ions to the outside and brings two potassium ions to the inside
2. two sodium ions to the outside and brings three potassium ions to the inside
3. three potassium ions to the outside and brings two sodium ions to the inside
4. two potassium ions to the outside and brings two potassium ions to the inside
The autonomic neural system relays impulse from the CNS to:
| I: | skeletal muscles |
| II: | smooth muscles |
| III: | involuntary organs |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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In the human eye, there are three types of cones – red blue and green. When these cones are stimulated equally, a sensation for which of the following colors would be produced?
| 1. White | 2. Black |
| 3. Orange | 4. Yellow |
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Most of the neurons in the cerebral cortex are:
| 1. | Unipolar | 2. | Bipolar |
| 3. | Multipolar | 4. | Pseudounipolar |
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1. Thalamus
2. Hypothalamus
3. Corpora quadrigemina
4. Pons
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When a neuron is resting, the axonal membrane is comparatively:
1. More permeable to sodium ions than for potassium ions
2. More permeable to potassium ions than for sodium ions
3. Equally permeable for potassium and sodium ions
4. Impermeable to sodium and potassium ions
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Nissl’s granules are seen in:
1. Only the cyton of the neuron
2. Only the axon of the neuron
3. Only in the cyton and dendrites of the neuron
4. In dendrites, cyton and axons of the neurons
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A canal called the cerebral aqueduct passes through the:
| 1. Cerebral hemispheres | 2. Diencephalon |
| 3. Mid brain | 4. Hind brain |
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