Q. No.The resting axonal membrane is impermeable/nearly impermeable to:
I. Sodium ions
II. Potassium ions
III. Negatively charged proteins
1.
Only I and II
2.
Only I and III
3.
Only II and III
4.
I, II and III
I. Sodium ions
II. Potassium ions
III. Negatively charged proteins
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Match the parts of the human brain in Column I with function in Column II and select the answer from the codes given:
| COLUMN I | COLUMN II | ||
| A. | Medulla oblongata | a. | Coordinating center for sensory and motor signaling |
| B. | Thalamus | b. | Regulation of gastric secretions |
| C. | Hypothalamus | c. | Thermoregulation and osmoregulation |
| D. | Hippocampus | d. | Consolidation of short term memory into long term memory |
Codes
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | b | a | d | c |
| 3. | a | b | d | c |
| 4. | b | a | c | d |
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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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Select the answer with correct matching of the structure, its location and function.
|
Structure |
Location |
Function |
|
|
1. |
Cerebellum |
Midbrain |
Controls respiration and gastric secretions |
|
2. |
Hypothalamus |
Forebrain |
Controls body temperature, urge for eating and drinking |
|
3. |
Blind spot |
Near the place where optic nerve leaves the eye |
Rods and cones are present but inactive here |
|
4. |
Eustachian tube |
Anterior part of internal ear |
Equalizes air pressure on either side of tympanic membrane |
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During the propagation of a nerve impulse, the action potential results from the movement of
1. Na+ ions from extracellular fluid to intracellular fluid.
2. K+ ions from extracellular fluid to intracellular fluid.
3. Na+ ions from intracellular fluid to extracellular fluid.
4. K+ ions from intracellular fluid to extracellular fluid.
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Which one of the following pairs of structures distinguishes a nerve cell from other types of cells?
1. Nucleus and mitochondria
2. Perikaryon and dendrites
3. Vacuoles and fibres
4. Flagellum and medullary sheath
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.
Consider the two statements:
I. Electrical synapses are rare in our system.
II. Electrical synapses conduct impulse faster than the chemical synapse.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. Only I is correct
4. Both I and II are incorrect
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Most of the synapses in vertebrates conduct information in only one direction. |
| Reason (R): | Only the postsynaptic cells can bind and respond to neurotransmitters. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Electrical synapses are faster but rare in human beings. |
| Reason (R): | Electrical synapses contain gap junctions that allow electric current to flow directly from one neuron to another. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
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