Measuring absolute & refractory periods
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What happens 1-2 milliseconds after the voltage gated Na+ channels open? | show 🗑
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| What channels open during action potential? What do they do? Why? | show 🗑
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| Describe the phase of after-hyperpolarisation (or the undershoot) | show 🗑
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| What 3 things make it harder for the 2nd action potential to be generated after the 1st action potential? | show 🗑
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| show | The time after an action potential where a 2nd action potential can be generated
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| Is the threshold for the 1st action potential the same or different from the 2nd action potential in a 60 msec interval? | show 🗑
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| What is the absolute refractory period? | show 🗑
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| show | The threshold for the second action potential will be higher (requiring a larger depolarization).
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| Why is it harder to generate a second action potential during the relative refractory period? | show 🗑
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| What is the original threshold for this neuron? | show 🗑
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| As the interval between stimuli decreases, the depolarization needed to generate the second action potential | show 🗑
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| show | 7.5 ms-60 msec
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| show | 3.75 msec answer to both Q's
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Created by:
meunid