「Nerve06/autonomic nervous system and synapses/saltatory conduction」の版間の差分
Soichi.Nakatake (トーク | 投稿記録) 編集の要約なし |
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{{QuizTitle}} | {{QuizTitle}} | ||
<GIFT> | <GIFT> | ||
//LEVEL:3 | //LEVEL:3 | ||
//RAND | //RAND | ||
At the node of Ranvier, which is the gap in the myelin, the electric resistance is {~high | At the node of Ranvier, which is the gap in the myelin, the electric resistance is {~high~=low} . | ||
//LEVEL:3 | //LEVEL:3 | ||
//RAND | //RAND | ||
Action potentials at the saltatory conduction, are generated {=only at | Action potentials at the saltatory conduction, are generated {=only at~at places other than} the node of Ranvier. | ||
//LEVEL:3 | //LEVEL:3 | ||
//RAND | //RAND | ||
Saltatory conduction is characteristic in the {=myelilnated | Saltatory conduction is characteristic in the {=myelilnated~non-myelinated} fibers. | ||
//LEVEL:3 | //LEVEL:3 | ||
//RAND | //RAND | ||
In saltatory conduction, the speed is {=fast | In saltatory conduction, the speed is {=fast~slow}. | ||
//LEVEL:3 | //LEVEL:3 | ||
//RAND | //RAND | ||
The conduction speed of the myelinated fibers are {=faster | The conduction speed of the myelinated fibers are {=faster~slower} than that of the non-myelinated fibers. | ||
//LEVEL:3 | //LEVEL:3 | ||
//RAND | //RAND | ||
The conduction speed of the non-myelinated fibers are {~faster | The conduction speed of the non-myelinated fibers are {~faster~=slower} than that of the myelinated fibers. | ||
</GIFT> | </GIFT> | ||
2014年11月18日 (火) 21:43時点における版
Saltatory conduction is the mode characteristic for the myelinated fibers. The conduction speed is high.
On a membrane of the nerve fiber, an action potential in one place conducts by depolarizes the 'neighboring' membrane (as above-mentioned).
In non-myelinated fibers, the myelin, which has high electric resistance, does not exist.
So, action potential can take place at any place.
So, the 'neighbor' depolarized by an action potential is close.
So, the conducting distance for a certain amount of time is short.
So, the conducting speed is slow.
In myelinated fibers, the myelin, which has high electric resistance, does exist.
So, it is not that action potential can take place at any place, but rather, only at the gaps of the myelin (called node of Ranvier), where the electric resistance is low.
So, the 'neighbor' depolarized by an action potential is far.
So, the conducting distance for a certain amount of time is long.
So, The conducting speed is fast.
Challenge Quiz
At the node of Ranvier, which is the gap in the myelin, the electric resistance is high low .
Action potentials at the saltatory conduction, are generated only at at places other than the node of Ranvier.
Saltatory conduction is characteristic in the myelilnated non-myelinated fibers.
In saltatory conduction, the speed is fast slow .
The conduction speed of the myelinated fibers are faster slower than that of the non-myelinated fibers.
The conduction speed of the non-myelinated fibers are faster slower than that of the myelinated fibers.