Biology · Coordination and Control
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How long does it take for an action potential to occur?
- A
Few minutes
- B
Few milliseconds
- C
Few hours
- D
Few seconds
Action potential is a temporary localized reversal of the polarity of the neurolemma, which occurs when the neurolemma is stimulated (e.g.electric shock, touch, sound, vibrations, etc). During the action potential, the polarity of the neurolemma first changes to +40mv (depolarization) and then restores to -65mv again (i.e., repolarization). This action is extremely rapid as it occurs only in a few milliseconds. to happen. Hence, option B is correct.
A few minutes – Action potentials occur too quickly to last for minutes; they are brief electrical impulses.
An action potential is a temporary localized reversal of the polarity of the neurolemma, which occurs when the neurolemma is stimulated (e.g., electric shock, touch, sound, vibrations, etc.). During the action potential, the polarity of the neurolemma first changes to +40 mV (i.e., depolarization) and then restores to -65 mV again (i.e., repolarization). This action is extremely rapid, as it occurs only in a few milliseconds. Hence, option B is correct.
A few hours – Action potentials are too fast and brief to last for hours.
A few seconds—While the overall signal transmission may take seconds, an individual action potential occurs in milliseconds, not seconds.
Tagged under Biology · Coordination and Control · 2023