12257619
Beschreibung
Quiz von Bethany Carter, aktualisiert more than 1 year ago
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Erstellt von Bethany Carter
vor mehr als 6 Jahre
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Frage 1
Frage
Sodium is higher in the extracellular space than in the cell body of neurons, causing a chemical gradient favoring the influx of sodium into the cell.
Antworten
- True
- False
Frage 2
Frage
Resting membrane potential in the cell body of a neuron is
Antworten
-
-40 mV
-
-90 mV
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-65 mV
Frage 3
Frage
What mechanism is responsible for creating the chemical charge of the membrane potential?
Antworten
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Na-K ATPase
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Fight or flight mechanism of ANS
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IPSP
Frage 4
Frage
In which of the following ways can an excitatory postsynaptic potential (EPSP) occur?
Antworten
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Opening of sodium channels
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Opening of chloride channels
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Closing of potassium channels
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Changes to intracellular structure such as an increase in number of excitatory membrane receptors.
Frage 5
Frage
Action potentials are "all or nothing."
Antworten
- True
- False
Frage 6
Frage
Which are stages of an action potential?
Antworten
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Resting stage (-90 mV)
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Depolarization stage (-70 to -50 mV)
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Absolute refractory period (-110 mV)
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Repolarization
Frage 7
Frage
What is the difference between an absolute refractory period and a relative refractory period?
Antworten
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In a relative refractory period, only a small action potential can be generated.
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There is no difference, they are two names for the same concept.
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During an absolute refractory period the neuron is completely unable to generate an action potential.
Frage 8
Frage
During repolarization, ligand-gated sodium channels close and potassium channels open.
Antworten
- True
- False
Frage 9
Frage
An action potential can be said to be self-propagating.
Antworten
- True
- False
Frage 10
Frage
How are myelin sheaths formed?
Antworten
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Via oligodentricytes
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Via glia
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Via Swann cells
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Via astrocytes
Frage 11
Frage
Which ion is responsible for binding and docking of synaptic vessels at the terminal bouton?
Antworten
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Sodium
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Calcium
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Chloride
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Acetylcholine
Frage 12
Frage
Spatial summation refers to the successive discharges from a single presynaptic terminal.
Antworten
- True
- False
Frage 13
Frage
In which ways are the influence of ESPS limited or nullfied?
Antworten
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Ligand-gated activation of G-protein
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Decremental conduction as ESPS moves away from the cell body
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Postsynaptic inhibition by release of GABA
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Decrease in the number of inhibitory receptors on the cell membrane
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