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Neuronal Structure and Function

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What is the name of the fatty substance the covers axons to improve their ability to conduct action potentials?

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A. Adipose tissue

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B. Extracellular matrix

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C. Myelin

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D. Neurolemma

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C. Myelin

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For the type of axon noted above, what is the name of the gap not covered by fatty substance?

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A. Internode

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B. Voltage-gated sodium channel

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C. Axon hillock

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D. Node of Ranvier

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D. Node of Ranvier

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What is the name of the force that determines which way ions will flow across the neural cell membrane when a certain ion pore opens?

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A. Electrical gradient

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B. Electromechanical gradient

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C. Electrochemical gradient

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D. Concentration gradient

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C. Electrochemical gradient

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What kind of ion channel must be opened to initiate an action potential at the axon hillock of a projection interneuron?

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A. Voltage-gated potassium channel

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B. Voltage-gated sodium channel

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C. Voltage-gated calcium channel

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D. Metabotropic receptors

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B. Voltage-gated sodium channel

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Assuming other characteristics are equal, the neuron with the fastest conduction velocity would be the one with the …

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A. Largest diameter axon

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B. Longest axon

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C. Highest number of voltage-gated sodium channels

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D. Smallest number of inhibitory synapses

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A. Largest diameter axon

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What is different about the axon membrane at the nodes of Ranvier than in the axon where it is wrapped with the substance produced by Schwann cells?

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A. There is a high degree of membrane resistance

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B. There is a high concentration of voltage-gated sodium channels

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C. There is no passive decay of the membrane potential

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D. Ligand-gated receptors are present to respond to neurotransmitters

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B. There is a high concentration of voltage-gated sodium channels

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Which one of these processes can NOT contribute ...

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