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WorksheetsNeuro 3
Total questions: 13
Worksheet time: 7mins
The brain neurotransmitters that may have opioid (pain relieving) properties is?
Enkephalin peptides
Dynorphin polypeptides.
B-Endorphins.
Catecholamines.
EPSPs produced by many different presynaptic fibers converging on a single postsynaptic neuron, causing summation on the postsynaptic dendrites and cell body, best describes
Synaptic plasticity.
Temporal summation.
Synaptic inhibition.
Spatial summation
Which of the following is NOT characteristic of presynaptic inhibition? A. B. C. T D.
The axon of a second neuron synapses with the axon (rather than the dendrite) of the original neuron.
The second neuron axon has a direct inhibitory effect on the original neuron axon.
The first neuron is partially depolarized by the release of a neurotransmitter from the second neuron.
Lesser amounts of a neurotransmitter is released by a neuron due to a second neuron that reduces the number of action potentials arriving at the original neuron terminal.
If a neurotransmitter binds to a receptor on the target cell and produces depolarizations the neurotransmitter_____
Was probably stimulating the flow of K+ ions out of the cell.
Produced an excitatory postsynaptic potential (EPSP).
Produced an inhibitory postsynaptic potential (IPSP).
Was probably stimulating the flow of Clions into the cell.
The ion that must flow into the presynaptic neuron ending through voltage-regulated channels to activate the release of neurotransmitter chemicals from synaptic vesicles is?
Sodium
Potassium.
Calcium.
Iron.
Electrical synapses____
Occur when two cells are joined by integrin proteins.
Are characterized by a synaptic cleft.
Occur between two cells of unequal size.
Require the presence of gap junctions.
As the intensity of stimulation increases, more and more nerve fibers will become activated - a process called ____
Frequency modulation
Amplitud modulation.
Cable properties of the neuron.
Recruitment.
Curare reduces the size of end plate potentials on the membrane of muscle fibers by ____
Competing with acetylcholine for attachment to the postsynaptic receptor proteins.
Blocking the release of acetylcholine from presynaptic vesicles.
Enhancing the breakdown of acetylcholine by acetylcholinesterase.
Blocking the flow of Na+ through open ion channels.
The first voltage-regulated gates encountered along the neuron membrane, which initiate the formation of action potentials, are located on the neuron near the ____
Postsynaptic membrane of the dendrite.
Cell body.
Axon hillock.
Axon terminal.
High doses of amphetamine tend to produce schizophrenic like symptoms, this lead to which theory about the ethiology of schizophrenia?
The dopaminergic hypothesis
The serotoninergic hypothesis
The neuropertidergic hypothesis.
None of the above
Which neurotransmitter is low in depression and mania (exaggerated euphoria)? A. . B. C. D.
Glutamate.
GABA.
Serotonin.
Histamine.
Which of the following enzymes is activated by cyclic AMP passing on the neurotransmitter signal?
Protein kinase A.
Protein kinase C.
Protein kinase G.
G protein receptor kinase.
Which second messenger signals the release of Ca+2 from the endoplasmic reticulum?
Cyclic AMP.
Cyclic GMP.
1,2 diacyl glycerol.
Inositol triphosphate.
