Hole's Human Anatomy & Physiology (Shier), 12th Edition

Ph.I.L.S. 3.0 Quizzing 25: Ph.I.L.S. 3.0 Quizzing

Ph.I.L.S. 3.0 Quizzing

1
Increasing the shock voltage from about 0.3 to 1 volt increased the amplitude of the CAP. This observation can be explained by:
A)an increase in the number of action potentials produced by increasing the shock voltage.
B)an increase in the number of axons brought to threshold and producing a single action potential.
C)an increase in the size of the action potentials.
2
A high voltage shock produced a CAP with maximum amplitude because:
A)all of the axons in the nerve produced an action potential.
B)all of the axons were producing a burst of action potentials.
C)the action potential in each axon had reached a maximum amplitude.
3
Compare the amplitude of the single CAP (written in blue above the graph) and the second CAP when the time interval between the two shocks was 7 milliseconds.
A)The two values are about the same.
B)The single CAP amplitude was much larger than the second CAP, which was evoked 7 ms after the first.
C)The single CAP amplitude was much smaller than the second CAP, which was evoked 7 ms after the first.
4
Look at your data. What happened to the amplitude of the second compound action potential when the time interval between the two shocks was increased from 7 to 9 milliseconds?
A)CAP amplitude increased.
B)CAP amplitude stayed about the same.
C)CAP amplitude decreased.
5
Look at your data. What happened to the amplitude of the second CAP when the time interval between the two shocks was decreased from 7 to 3 milliseconds?
A)CAP amplitude increased.
B)CAP amplitude stayed about the same.
C)CAP amplitude decreased.
6
Look at your data. What was the longest time interval when the second CAP was smaller than those recorded at an interval greater than 7 milliseconds?
A)About 6.5 milliseconds.
B)About 5 milliseconds.
C)About 3.5 milliseconds.
D)About 1.5 milliseconds.
7
The amplitude of an action potential produced during the relative refractory period is smaller because:
A)fewer voltage-gated sodium channels open.
B)more voltage-gated potassium channels open.
C)some voltage-gated potassium channels that were opened by the previous action potential remain open.
8
During the relative refractory period the threshold for action potential production is increased. In this lab, this resulted in a reduction in the amplitude of the second CAP because:
A)fewer axons were firing during the second CAP.
B)each axon produced a burst of action potentials with fewer spikes.
C)some of the axons were in their absolute refractory period.
9
Look at your data. Was there a time interval where no second CAP was recorded? This is the absolute refractory period.
A)About 7 milliseconds.
B)About 5 milliseconds.
C)About 3 milliseconds.
D)About 1 millisecond.
10
During the absolute refractory period no second CAP was recorded because:
A)the voltage-gated sodium channels can open, but the shock needs to be bigger to produce action potentials.
B)the voltage-gated sodium channels are inactivated, so can not open to produce an action potential.
C)all of the voltage-gated potassium channels are open, so the action potentials are too small to be recorded.
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe

Please read our Terms of Use and Privacy Notice before you explore our Web site. To report a technical problem with this Web site, please contact the Web Producer.