Q. No.All the following statements with respect to the propagation of action potentials are correct except:
1. Saltatory conduction occurs in myelinated nerve fibers
2. During conduction of an action potential, current flows from the active area of the membrane to the adjacent inactive area, thereby decreasing the potential in the inactive area to the threshold
3. Action potential propagation is faster in myelinated fibers than in unmyelinated ones
4. Action potential propagation is faster for strong stimuli than for weaker stimuli
1. Saltatory conduction occurs in myelinated nerve fibers
2. During conduction of an action potential, current flows from the active area of the membrane to the adjacent inactive area, thereby decreasing the potential in the inactive area to the threshold
3. Action potential propagation is faster in myelinated fibers than in unmyelinated ones
4. Action potential propagation is faster for strong stimuli than for weaker stimuli
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The relatively static membrane potential of quiescent cells is called the:
| 1. | action potential | 2. | threshold potential |
| 3. | resting membrane potential | 4. | graded potential |
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Branched protoplasmic extensions of a nerve cell that propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron are the:
| 1. | axons | 2. | axon hillocks |
| 3. | axon collaterals | 4. | dendrites |
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The change in membrane potential that returns it to a negative value just after an action potential has changed the membrane potential to a positive value is called as:
| 1. | depolarization | 2. | hyperpolarization |
| 3. | repolarization | 4. | overshoot |
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Corpus callosum:
1. is a part of the ventricular system.
2. divides the frontal lobe from the parietal lobe.
3. connects the right and left cerebral hemispheres.
4. is an extension of the diencephalon.
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A funnel shaped structure, the infundibulum, connects hypothalamus and:
| 1. | anterior pituitary | 2. | posterior pituitary |
| 3. | pineal gland | 4. | thalamus |
The part of the brain that controls important cognitive skills in humans, such as emotional expression, problem solving, memory, language, judgment, and sexual behaviors is the:
| 1. | frontal lobe | 2. | parietal lobe |
| 3. | occipital lobe | 4. | temporal lobe |
The part of the brain that has the most effect on maintenance of homeostasis is:
| 1. | thalamus | 2. | hypothalamus |
| 3. | infundibulum | 4. | mammillary body |
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A duct within the mesencephalon, contains cerebrospinal fluid (CSF), and connects the third ventricle to the fourth ventricle is called:
| 1. | interventricular foramen | 2. | cerebral aqueduct |
| 3. | foramen of Monro | 4. | foramen of Magendie |
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Very fast correction during the ongoing rapid muscular activity initiated elsewhere is done by:
| 1. | Primary motor cortex | 2. | Wernicke’s area |
| 3. | Basal ganglia | 4. | Cerebellum |
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