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Return to Biological Science: Biomedical edition e-Book and Sample Student Resources
Module 3 Chapter 17 Multiple choice questions 17.4
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.
What is the approximate duration of a typical action potential, from initiation to a stable return to resting membrane potential?
1 ms
correct
incorrect
3 ms
correct
incorrect
5 ms
correct
incorrect
10 ms
correct
incorrect
*
not completed
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The α-subunit of voltage-gated sodium channels contains four domains, each comprising six transmembrane helices. How does the α-subunit of voltage-gated sodium channels control sodium movement through the cell membrane?
The S1-4 helices form the channel pore and the S5-6 helices are part of the voltage-sensor. The link between domains 1 and 2 forms the inactivation gate.
correct
incorrect
The S1-4 helices form the channel pore and the S5-6 helices are part of the voltage-sensor. The link between domains 3 and 3 forms the inactivation gate.
correct
incorrect
The S1-4 helices form the voltage-sensor and the S5-6 helices are part of the channel pore. The link between domains 1 and 2 forms the inactivation gate.
correct
incorrect
The S1-4 helices form the voltage-sensor and the S5-6 helices are part of the channel pore. The link between domains 3 and 4 forms the inactivation gate.
correct
incorrect
*
not completed
.
By what percentage is the total number of sodium ions (Na
+
) inside an axon estimated to change due to sodium ion influx during an action potential?
0.05%
correct
incorrect
0.5%
correct
incorrect
5%
correct
incorrect
50%
correct
incorrect
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