Q:

What is meant by an absolute refractory period?

belongs to book: Examination Questions and Answers in Basic Anatomy and Physiology|Martin Caon|| Chapter number:14| Question number:46

waelhammad

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2022-10-19

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What is meant by an absolute refractory period?

at least 5 ms must elapse from the time of the fi rst action potential before a second can be initiated
an action potential cannot be initiated during this period regardless of the strength of the stimulus
an action potential can be initiated if the strength of the stimulus is higher than normal (>70 mV)
an action potential can be initiated if the strength of the stimulus is lower than normal (<70 mV)

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waelhammad

2022-10-19

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B: During the ~0.5 ms period of the action potential in which sodium ions are rushing into a nerve cell, the nerve cannot respond to any stimulus not matter how strong the stimulus. Because of the impossibility of response, this period is called “absolutely” refractive. (refractory = resisting ordinary methods)

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