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Anatomy & Physiology Exam 3
Neurophysiology
10
Anatomy
Undergraduate 2
04/13/2010

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