12257619
Descripción
Test por Bethany Carter, actualizado hace más de 1 año
|
Creado por Bethany Carter
hace más de 6 años
|
|
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
-
-90 mV
-
-65 mV
Pregunta 3
Pregunta
What mechanism is responsible for creating the chemical charge of the membrane potential?
Respuesta
-
Na-K ATPase
-
Fight or flight mechanism of ANS
-
IPSP
Pregunta 4
Pregunta
In which of the following ways can an excitatory postsynaptic potential (EPSP) occur?
Respuesta
-
Opening of sodium channels
-
Opening of chloride channels
-
Closing of potassium channels
-
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
-
Resting stage (-90 mV)
-
Depolarization stage (-70 to -50 mV)
-
Absolute refractory period (-110 mV)
-
Repolarization
Pregunta 7
Pregunta
What is the difference between an absolute refractory period and a relative refractory period?
Respuesta
-
In a relative refractory period, only a small action potential can be generated.
-
There is no difference, they are two names for the same concept.
-
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
-
Via oligodentricytes
-
Via glia
-
Via Swann cells
-
Via astrocytes
Pregunta 11
Pregunta
Which ion is responsible for binding and docking of synaptic vessels at the terminal bouton?
Respuesta
-
Sodium
-
Calcium
-
Chloride
-
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
-
Ligand-gated activation of G-protein
-
Decremental conduction as ESPS moves away from the cell body
-
Postsynaptic inhibition by release of GABA
-
Decrease in the number of inhibitory receptors on the cell membrane
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.