Term
how are action potentials moved throughout the axon?
what happens at each patch of membrane? |
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Definition
-they are propagated down the entire length of axons
-the original action potential is newly generated |
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Term
| when is the original action potential newly generated? |
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Definition
| -at each patch of membrane |
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Term
| how does each action potential differ from the initial one? |
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Definition
-each is identical to the initial one
-action potentials do not decrease in intensity during propagation to reproduce or spread |
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Term
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Definition
-each action potential is all or none
-once threshold is reached a complete action potential is generated
-generating a partial potential is not possible |
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Term
| what is absolute refractory period? |
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Definition
-the state of a membrane during depolarization when sodium channels are still OPEN
-during this time, the membrane cannot respond to any further stimulation, no matter how strong |
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Term
| when can the membrane not respond to any further stimulation? |
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Definition
-absolute refractory period
-(during depolarization) -when sodium channels are still open
-no matter HOW strong, the membrane wont respond |
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Term
| what is relative refractory period? |
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Definition
-during repolarization
-the state of a membrane when sodium channels CLOSE and potassium channels OPEN
-membrane CAN respond to further stimulation IF stimulus is strong enough |
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Term
| what happens if the membrane is strong enough during the relative refractory period? |
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Definition
| -the membrane can respond to further stimulation |
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Term
what period happens during repolarization?
-depolarization? |
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Definition
-repolarization -relative refractory period
-depolarization -absolute refractory period |
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Term
| what state are sodium channels in during relative refractory period? absolute? |
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Definition
-relative: sodium channels CLOSE and potassium channels open
-absolute: sodium channels are still OPEN |
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