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WorksheetsNeuroscience Quiz
Total questions: 20
Worksheet time: 10mins
Action potential is best described as?
A graded potential
A local response
A propagated electrical signal
A synaptic potential
Resting membrane potential of a neuron is approximately?
+30 mV
-70 mV
-40 mV
0 mV
Which ion is mainly responsible for depolarization during action potential?
Potassium
Chloride
Calcium
Sodium
Opening of voltage-gated sodium channels causes?
Repolarization
Hyperpolarization
Depolarization
Resting state
Threshold potential of a neuron is around?
-90 mV
-70 mV
-55 mV
+30 mV
All-or-none law means?
AP size varies with stimulus strength
AP occurs only at synapse
AP is same once threshold is reached
AP occurs only in myelinated fibers
Repolarization phase is mainly due to?
Opening of Na+ channels
Closing of K+ channels
Opening of K+ channels
Inactivation of Cl− channels
Hyperpolarization occurs because of?
Delayed opening of Na+ channels
Prolonged opening of K+ channels
Closure of Na+ channels only
Opening of Ca2+ channels
Absolute refractory period is due to?
Inactivation of Na+ channels
Opening of K+ channels
Hyperpolarization only
Resting membrane potential
Relative refractory period is caused by?
Na+ channel inactivation
Excess K+ efflux
Na+ influx only
Cl− influx
Myelinated nerve fibers conduct impulses by?
Continuous conduction
Saltatory conduction
Electrotonic conduction
Diffusion
Nodes of Ranvier are rich in?
Leak channels only
Voltage-gated Na+ channels
Voltage-gated Ca2+ channels
Cl− channels
Amplitude of action potential depends on?
Strength of stimulus
Diameter of axon
Na+ equilibrium potential
Number of stimuli
Velocity of action potential increases with?
Decrease in axon diameter
Decrease in temperature
Myelination
Increased membrane resistance
Action potential duration in neuron is about?
0.1 ms
1 ms
10 ms
100 ms
During peak of action potential membrane potential is around?
-70 mV
-55 mV
0 mV
+30 mV
Which factor does NOT affect conduction velocity?
Axon diameter
Myelination
Temperature
Strength of stimulus
Local anesthetics block action potential by blocking?
Potassium channels
Chloride channels
Voltage-gated sodium channels
Calcium channels
Action potential is not generated in?
Dendrites
Axon hillock
Nodes of Ranvier
Initial segment
Direction of action potential propagation is unidirectional because of?
Threshold phenomenon
All-or-none law
Refractory period
Saltatory conduction
