Biology 241 - Accelerated General Human Physiology » Summer 2021 » Lab Q8

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Question #1
Which of the following will increase conduction velocity in a nerve?
A.   myelination, warming the nerve
B.   warming the nerve, unmyelination
C.   unmyelination, cooling the nerve
D.   cooling the nerve, myelination
Question #2
What was the effect of cooling on the time delay between the stimulus and the compound action potential (CAP)?
A.   cooling increased the time delay
B.   cooling decreased the time delay
C.   cooling did not affect the time delay
Question #3
During both the relative refractory period and the absolute refractory period, another action potential cannot be generated no matter how strong the stimulus is increased.
A.   FALSE
B.   TRUE
Question #4
During an action potential, the inside of the cell initially goes from negative to positive. This membrane depolarization, in which the inside of the cell becomes positive, is produced by:
A.   potassium moving out of the cell
B.   potassium moving into the cell
C.   sodium moving out of the cell
D.   sodium moving into the cell
Question #5
In the compound action potential experiment, the measurements are called compound action potentials because:
A.   multiple measurements are added together.
B.   several measurements are taken.
C.   the response is due to several nerves being stimulated
D.   the measured response correlates to how many axons are being stimulated.
Question #6
During the action potential, voltage-gated channels open so that:
A.   the sodium and potassium channels open at random.
B.   the sodium channels are fully open at the same time as the potassium channels.
C.   the sodium channels are fully open after the potassium channels.
D.   the sodium channels are fully open before the potassium channels.
Question #7
In the compound action potential experiment, a low voltage electrical stimulus (0 or 0.1 volts) produced no response on the screen because:
A.   the stimulus was below threshold, so it did not produce any action potentials.
B.   the action potentials were too small to register.
C.   the stimulus did not reach the recording electrodes.
Question #8
A high-voltage stimulus produced a CAP with maximum amplitude because:
A.   the action potential in each axon had reached maximum amplitude.
B.   all of the axons in the nerve produced an action potential.
C.   all of the axons were producing a burst of action potentials.

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