Nervous System -- questions w/ pics
Destruction of which of the neuroglial cell types leads to the disease multiple scleroses (MS)?
A
Which of the neuroglial cell types shown form myelin sheaths within the CNS?
A
Which of the following is true regarding a response to an excitatory event which might occur soon after the initial stimulus indicated in the graph?
An excitatory event may result in an action potential, but this will be less likely if the excitatory stimulus occurs during the response to the stimulus observed in the graph
Which result of the stimulus applied is the likely cause of the response observed in the left graph?
opening of gated Na+ channels
Which of the following is expected to occur first if the membrane potential increase shown in the graph were to reach the threshold value indicated at -55 mV?
opening of voltage gated Na+ channels
Which of the following most accurately describes the involvement of the structure labeled B in synaptic signaling?
release of neurotransmitter into the synaptic cleft by exocytosis
The box labeled D illustrates three mechanisms by which the effects of a neurotransmitter may be terminated. Which of the following mechanisms is NOT included in the figure?
reuptake of the neurotransmitter by transport into the postsynaptic cell
At which point of the illustrated action potential are the most gated Na+ channels open?
B
Which lettered region in the figure is referred to as the soma?
B
Which of the neuroglial cell types shown is the most abundant in the CNS?
B
Which areas of this neuron would be classified as receptive regions?
Both A and B
Which of the following statements is true of both membrane potential responses shown in the graphs?
Both responses are examples of graded potentials.
In which area of the neuron is an action potential initially generated?
C
Which of the following membrane regions would have significant numbers of voltage-gated Na and K ion channels?
C and D
Which of the neuroglial cell types shown control the flow of cerebrospinal fluid within the CNS?
D
Which area would contain an abundance of vesicles containing neurotransmitter?
E
Which of the neuroglial cell types shown are found in the PNS?
E
Signals generated at a chemical synapse are said to move only in the direction of the presynaptic cell to the postsynaptic cell. Which of the following statements regarding the mechanisms determining this one way transmission is INCORRECT?
Ions diffusing out of the presynaptic cell can enter the postsynaptic cell, but cannot reenter the presynaptic cell.
Which of the following statements most accurately describes the effects caused by binding of the ligand shown to the structure labeled C?
The membrane potential of the postsynaptic membrane changes
What event is depicted in the structure labeled A?
movement of Ca2+ into the interior of the axonal terminus through voltage-gated channels
What structural classification describes this neuron?
multipolar
What change in a neuron is being measured in the graph?
the voltage measured across the axon membrane at a specific point as an action potential travels past
What structural classification describes the neuron associated with the neuroglia shown by E and F?
unipolar
