Q. No.All the following statements regarding an action potential are true except that they:
1. are all or none events
2. occur when depolarization reaches a threshold potential
3. do not add or interfere with one another
4. are propagated along axons with a decrease in amplitude
1. are all or none events
2. occur when depolarization reaches a threshold potential
3. do not add or interfere with one another
4. are propagated along axons with a decrease in amplitude
A drug acts as an inhibitor of acetylcholinesterase. Administration of this drug would lead to:
1. accumulation of acetylcholine in the synaptic cleft
2. accumulation of acetylcholinesterase in the synaptic cleft
3. muscle relaxation
4. repeated action potentials
The part of the mammalian brain that has shown maximum relative growth is the:
1. the cerebellum
2. the cerebrum
3. the diencephalon
4. corpora quadrigemina
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Interneurons:
1. are seen only in the central nervous system
2. are seen only in the peripheral nervous system
3. are always motor in nature
4. occur in the central nervous system and link afferent and efferent neurons
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Neurotransmitters:
1. are chemical signals.
2. are broken down slowly after they are released.
3. occur in gap junctions.
4. are released by the postsynaptic cell.
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Impulses are carried towards the soma of the neuron by:
1. intermediate filaments
2. axon
3. neurotransmitter
4. dendrites
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Identify the neurotransmitter that is correctly matched with the amino acid it is derived from:
1. serotonin derived from phenylalanine
2. norepinephrine derived from glycine
3. acetylcholine derived from cysteine
4. epinephrine derived from tyrosine
The four major lobes of the cerebrum are called as:
1. dorsal, ventral, lateral and medial
2. parietal, frontal, dorsal, occipital
3. motor, sensory, associative and integrative
4. frontal, parietal, temporal and occipital
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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Which of the following has most of the cerebrospinal fluid at any instant?
1. dural sinuses
2. pia mater
3. subarachnoid space
4. epidural space
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