Multiple Choice Questions

Which of the following describes a B fiber?
  • tetrodotoxin and lidocaine
  • medium diameter, lightly myelinated
  • The number of action potentials decreased.
  • An action potential was always seen at R1.
Which of the following is used to block pain?
  • medullary region
  • lidocaine
  • medium diameter, lightly myelinated
  • tetrodotoxin and lidocaine
The nodes of Ranvier are _______.
  • locations on the axon where the myelin sheath is absent
  • similar, but tetrodotoxin had a greater effect
  • entering the cell must overcome the potassium exiting
  • lower than potassium intracellularly.
The conducting region of the neuron is the _______.
  • leakage
  • axon
  • similar, but tetrodotoxin had a greater effect
  • lidocaine
The minimum voltage that is required to generate an action potential is called the _______.
  • lower than potassium intracellularly.
  • threshold voltage
  • hyperpolarized
  • medullary region
A nerve is _______.
  • threshold voltage
  • medullary region
  • a bundle of axons
  • no change to the action potential
To reach threshold, the amount of sodium _______.
  • similar, but tetrodotoxin had a greater effect
  • is called the conduction velocity and is measured in meters/sec
  • entering the cell must overcome the potassium exiting
  • decreases the time between action potentials
We describe the regeneration of the action potential down the membrane of the axon of the neuron as ______.
  • An action potential was always seen at R1.
  • conduction or propagation
  • no change to the action potential
  • sodium-potassium pump
The typical concentration of sodium is _______.
  • no change to the action potential
  • the largest and most heavily myelinated axons
  • lower than potassium intracellularly.
  • An action potential was always seen at R1.
Which of the following blocks voltage-gated sodium channels?
  • medullary region
  • The number of action potentials decreased.
  • tetrodotoxin and lidocaine
  • The receptor potential is carried by neuroglia.
The channels that provide for the movement of potassium in the resting neuron are _______.
  • voltage
  • C fibers
  • trigger zone
  • leakage
The rate with which an action potential travels along an axon ____.
  • the largest and most heavily myelinated axons
  • entering the cell must overcome the potassium exiting
  • is called the conduction velocity and is measured in meters/sec
  • similar, but tetrodotoxin had a greater effect
Which fibers generate the smallest value for conduction velocity?
  • medullary region
  • lidocaine
  • The number of action potentials decreased.
  • C fibers
The region on the neuron where action potentials are generated is called the ______.
  • trigger zone
  • threshold voltage
  • leakage
  • hyperpolarized
Increasing the amount of myelination _____.
  • entering the cell must overcome the potassium exiting
  • decreases the time between action potentials
  • no change to the action potential
  • the largest and most heavily myelinated axons
Which of the following occurred in the presence of tetrodotoxin?
  • The receptor potential is carried by neuroglia.
  • The number of action potentials decreased.
  • An action potential was always seen at R1.
  • medium diameter, lightly myelinated
If an increase in extracellular potassium hyperpolarizes a neuron, which of the following would be correct?
  • It would change the membrane potential to a more negative value.
  • entering the cell must overcome the potassium exiting
  • is called the conduction velocity and is measured in meters/sec
  • a receptor potential, a synaptic potential or an action potential
What effect did increasing the extracellular potassium have on the resting membrane potential?
  • The receptor potential is carried by neuroglia.
  • similar, but tetrodotoxin had a greater effect
  • The resting membrane potential became less negative.
  • Only a small change occurred, because the resting neuron is not very permeable to sodium.
Which of the following is described correctly?
  • a receptor potential, a synaptic potential or an action potential
  • medium diameter, lightly myelinated
  • Schwann cells provide the myelination in the peripheral nervous system.
  • The number of action potentials decreased.
The effects of lidocaine and tetrodotoxin were _______.
  • lower than potassium intracellularly.
  • the largest and most heavily myelinated axons
  • locations on the axon where the myelin sheath is absent
  • similar, but tetrodotoxin had a greater effect
An action potential requires ______.
  • locations on the axon where the myelin sheath is absent
  • entering the cell must overcome the potassium exiting
  • decreases the time between action potentials
  • voltage-gated sodium channels to open and sodium to flow with its electrochemical gradient
An axon that is more negative than the resting membrane potential is said to be _______.
  • threshold voltage
  • hyperpolarized
  • trigger zone
  • medullary region
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Multiple Choice Questions
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