12257619
Descripción
Test por Bethany Carter, actualizado hace más de 1 año
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Creado por Bethany Carter
hace casi 7 años
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Pregunta 1
Pregunta
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.
Respuesta
- True
- False
Pregunta 2
Pregunta
Resting membrane potential in the cell body of a neuron is
Respuesta
-
-40 mV
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-90 mV
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-65 mV
Pregunta 3
Pregunta
What mechanism is responsible for creating the chemical charge of the membrane potential?
Respuesta
-
Na-K ATPase
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Fight or flight mechanism of ANS
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IPSP
Pregunta 4
Pregunta
In which of the following ways can an excitatory postsynaptic potential (EPSP) occur?
Respuesta
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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.
Pregunta 5
Pregunta
Action potentials are "all or nothing."
Respuesta
- True
- False
Pregunta 6
Pregunta
Which are stages of an action potential?
Respuesta
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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
Pregunta 7
Pregunta
What is the difference between an absolute refractory period and a relative refractory period?
Respuesta
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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.
Pregunta 8
Pregunta
During repolarization, ligand-gated sodium channels close and potassium channels open.
Respuesta
- True
- False
Pregunta 9
Pregunta
An action potential can be said to be self-propagating.
Respuesta
- True
- False
Pregunta 10
Pregunta
How are myelin sheaths formed?
Respuesta
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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
Pregunta 11
Pregunta
Which ion is responsible for binding and docking of synaptic vessels at the terminal bouton?
Respuesta
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Sodium
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Calcium
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Chloride
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Acetylcholine
Pregunta 12
Pregunta
Spatial summation refers to the successive discharges from a single presynaptic terminal.
Respuesta
- True
- False
Pregunta 13
Pregunta
In which ways are the influence of ESPS limited or nullfied?
Respuesta
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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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