교과서 질문
What is the functional difference among chemically gated (ligand-gated), voltage-gated, and mechanically gated ion channels?
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11. Nervous Tissue and Nervous System
The Refractory Period
객관식
Which of the following statements is true regarding the absolute refractory period?
A
It is the phase when the neuron is hyperpolarized.
B
It is the period during which a second action potential cannot be initiated, regardless of the strength of the stimulus.
C
It occurs after the relative refractory period.
D
It allows for the summation of multiple action potentials.
검증된 단계별 안내1
Understand the concept of the absolute refractory period: It is a phase in the action potential of a neuron where no new action potential can be initiated, regardless of the strength of the incoming stimulus.
Recognize that during the absolute refractory period, the sodium channels are inactivated, preventing any depolarization necessary for a new action potential.
Differentiate between the absolute and relative refractory periods: The absolute refractory period occurs immediately after an action potential, while the relative refractory period follows it and allows for the possibility of initiating another action potential if the stimulus is strong enough.
Identify that the absolute refractory period ensures that action potentials are unidirectional and do not overlap, maintaining the integrity of the signal transmission.
Conclude that the statement 'It is the period during which a second action potential cannot be initiated, regardless of the strength of the stimulus' is true regarding the absolute refractory period.
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