1. Which of the following is the cell type most directly relevant to battling th
ID: 2258570 • Letter: 1
Question
1. Which of the following is the cell type most directly relevant to battling the pathogens the bullet likely
carried into the brain of Rep. Gabrielle Giffords?
A. Schwann cells
B. microglia
C. oligodendrocytes
D. astrocytes
E. arachnoid villi
2. Which of the following is a cell type important for re-myelinating axons in damaged portions of the
recovering brain of Rep. Gabrielle Giffords?
A. Schwann cells
B. microglia
C. oligodendrocytes
D. astrocytes
E. arachnoid villi
3. Which of the following is the cell type interacting with endothelial cells via endfeet in the recovering brain
of Rep. Gabrielle Giffords?
A. Schwann cells
B. microglia
C. oligodendrocytes
D. astrocytes
E. arachnoid villi
4. Rep. Gabrielle Giffords had to remain in the intensive care unit for longer than originally planned
because of excessive intracranial pressure. Which of the following is most relevant to the uptake of the fluid
responsible for causing this pressure?
A. carotid artery
B. choroid plexus
C. oligodendrocytes
D. astrocytes
E. arachnoid villi
5. Which of the following correctly describes how myelination alters the passive properties of the neuronal
membrane?
A. causes faster decay of depolarization by reducing resistance
B. increases resistance, reduces capacitance
C. regenerates the action potential after skipping a large stretch of axon
D. decreases flux through Na+ channels, thereby speeds up action potential
E. none of the above are completely correct
MCDB 4777/5777 2/2/11 EXAM I Page 2
6. Which factors contribute to the squid axon
Which of the following is the cell type most directly relevant to battling the pathogens the bullet likely carried into the brain of Rep. Gabrielle Giffords? Which of the following is a cell type important for re-myelinating axons in damaged portions of the recovering brain of Rep. Gabrielle Giffords? Which of the following is the cell type interacting with endothelial cells via endfeet in the recovering brain of Rep. Gabrielle Giffords? Rep. Gabrielle Giffords had to remain in the intensive care unit for longer than originally planned because of excessive intracranial pressure. Which of the following is most relevant to the uptake of the fluid responsible for causing this pressure? Which of the following correctly describes how myelination alters the passive properties of the neuronal membrane? Which factors contribute to the squid axon's refractory period? In which of the following ways does the voltage-gated "delayed rectifier" potassium channel in the squid giant axon (i.e. the channel we discussed as important in the action potential) differ from the voltage-gated sodium channels? The proteins that use ATP to establish the ionic gradients responsible for action potentials are part of the larger category of: The example of NaV1.7, mutated in some congenital pain syndromes, provide evidence of all of the following excepta. The voltage clamp technique is most useful for...Explanation / Answer
C. oligodendrocytes
A. Schwann cells
A. Schwann cells
A. carotid artery
D. decreases flux through Na+ channels, thereby speeds up action potential
D. inactivation domain of calcium gated potassium channel; flux through inward rectifier potassium
B. the potassium channels lack selective permeability
D. inward rectifier or
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