The absolute refractory period occurs _________________.
 |
 |
prior to the onset of an action potential; |
 |
while an action potential is in progress; |
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during the rising phase of an action potential; |
 |
after the completion of an action potential; |
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both the alternatives b and c are correct; |
[Review Part 1 of the tutorial]
[Review Part 2 (Matching) of the tutorial]