Q. No.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 |
A person entering an empty room suddenly finds a snake, right in front, on opening the door. Which one of the following is likely to happen in his neurohormonal control system?
1. Sympathetic nervous system is activated, releasing epinephrine and norepinephrine from adrenal medulla
2. Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse
3. Hypothalamus activates the parasympathetic division of brain
4. Sympathetic nervous system is activated, releasing epinephrine and norepinephrine from adrenal cortex
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
1. nerve fibre is insulated by a medullary sheath
2. sodium pump starts operating only at the cyton and then continues into the nerve fibre
3. neurotransmitters are released by dendrites and not by axon endings
4. neurotransmitters are released by the axon endings and not by dendrites.
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