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What happens to the action potential if you have a strong stimulus?
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A strong stimulus will cause the firing of action potentials to increase
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Absolute Refractory Period
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The sodium channels have to re-set and can only do this once the membrane is hyperpolarized. During this period NO action potential can FIRE.
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How long is the absolute refractory period?
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It is as long as the duration of an action potential.
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Relative Refractory Period
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A larger than normal depolarization needed to cause an action potential to fire.
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During the rising phase what is going on?
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During the rising phase, the sodium will flow into the cell to depolarize membrane
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During the falling phase what is going on?
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During the falling phase, the potassium channels are open to let K flow out of cell...to repolarize cell.
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What is the threshold frequency that needs to be reached in order to depolarize a neuron?
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-40mV.
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Which gates open fast and/or slow involved in action potentials?
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The fast opening gates are the sodium and the slow opening are the potassium
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When Sodium rushes into the cell at the start of an depolarization, what attracts it in?
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The negativity of the membrane potential.
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How does an action potential spread to the rest of the axox of a neuron?
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The sodium that came in during the depoloration phase will cause the memrbane in front of it to depolarize...it is like a cycle
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Why can an action potential not travel backwards?
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Bc of the refractory period..it will not allow another action potential to occur
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What affects the conduction of an action potential ? What two factors?
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The thickness of the axon ..the thicker the axon the faster the transmission adn myelination.
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Where does an action potential begin?
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The axon hillock!
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