EEOB 2520 Exam 4 Practice Questions
and Answers
The graded potentials starting each myelinated section of axon ( i.e, end of each node) are ___ in size.
The first action potentials at the start of each node (i.e, just after a myelinated section) are ___ in size. -
ANSWER-Identical - identical
...
During anatomy lab, you dissect a group of axons in the cadaver's right wrist. You correctly tell your lab
partner that you are observing ___ cells and parts of ___ neurons. - ANSWER✔✔-Schwann - afferent or
efferent
A correct series of events during an action potential is - ANSWER✔✔-Depolarization, threshold,
repolarization
Sodium influx, potassium outflux
During an action potential, which type of channels are open at the peak (i.e., highest amplitude) of the
Vm? - ANSWER✔✔-The voltage-gated sodium channels
The voltage-gated potassium channels.
Astrocytes are physically ___ than neurons and cause ___ neurotransmitters to be available for the
neurons. - ANSWER✔✔-Smaller - less
Cell B's cytosol is observed to be more negatively charged than the surrounding interstitial fluid. A
mechanically-gated sodium channel is open in Cell B. Assuming a typical sodium distribution, sodium
would have a net movement ___ Cell B. - ANSWER✔✔-Into
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