12257619
Description
Quiz by Bethany Carter, updated more than 1 year ago
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Created by Bethany Carter
almost 7 years ago
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Question 1
Question
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.
Answer
- True
- False
Question 2
Question
Resting membrane potential in the cell body of a neuron is
Answer
-
-40 mV
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-90 mV
-
-65 mV
Question 3
Question
What mechanism is responsible for creating the chemical charge of the membrane potential?
Answer
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Na-K ATPase
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Fight or flight mechanism of ANS
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IPSP
Question 4
Question
In which of the following ways can an excitatory postsynaptic potential (EPSP) occur?
Answer
-
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.
Question 5
Question
Action potentials are "all or nothing."
Answer
- True
- False
Question 6
Question
Which are stages of an action potential?
Answer
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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
Question 7
Question
What is the difference between an absolute refractory period and a relative refractory period?
Answer
-
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.
Question 8
Question
During repolarization, ligand-gated sodium channels close and potassium channels open.
Answer
- True
- False
Question 9
Question
An action potential can be said to be self-propagating.
Answer
- True
- False
Question 10
Question
How are myelin sheaths formed?
Answer
-
Via oligodentricytes
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Via glia
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Via Swann cells
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Via astrocytes
Question 11
Question
Which ion is responsible for binding and docking of synaptic vessels at the terminal bouton?
Answer
-
Sodium
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Calcium
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Chloride
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Acetylcholine
Question 12
Question
Spatial summation refers to the successive discharges from a single presynaptic terminal.
Answer
- True
- False
Question 13
Question
In which ways are the influence of ESPS limited or nullfied?
Answer
-
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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