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WorksheetsNeuron and Neurotransmitter
Total questions: 6
Worksheet time: 3mins
Which part of the neuron is primarily responsible for integrating incoming synaptic signals and initiating an action potential if the threshold is reached?
Dendrites
Axon hillock
Axon terminal
Nodes of Ranvier
Which ion is most responsible for the depolarization phase of a neuronal action potential?
Potassium (K⁺)
Calcium (Ca²⁺)
Sodium (Na⁺)
Magnesium (Mg²⁺)
Which of the following best describes the role of the myelin sheath in neuronal transmission?
It facilitates neurotransmitter release at synapses
It increases the capacitance of the axonal membrane
It allows for saltatory conduction, speeding up action potential propagation
It increases resistance across the membrane, slowing signal propagation
Which neurotransmitter is primarily inhibitory in the adult central nervous system and acts by increasing chloride ion influx?
Glutamate
Acetylcholine
Dopamine
GABA
Which of the following best explains how neurotransmitters are removed from the synaptic cleft to terminate the signal?
Only by enzymatic degradation
Only by diffusion out of the cleft
By active transport into glial cells only
By a combination of enzymatic degradation, diffusion, and reuptake into the presynaptic neuron
During the repolarization phase of an action potential, which of the following events occurs?
Voltage-gated sodium channels open
Potassium ions exit the neuron
Calcium ions enter the neuron
Sodium-potassium pump inactivates
