「Nerve06/autonomic nervous system and synapses/saltatory conduction」の版間の差分

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有髄神経に特徴的な伝導様式です．伝導速度が速い．
Saltatory conduction is the mode characteristic for the myelinated fibers.  The conduction speed is high.


[[ファイル:04224en.jpg|500px]]   
[[ファイル:04224en.jpg|500px]]   


神経細胞膜では，１ヶ所の活動電位が「となり」の膜を脱分極させることで活動電位（興奮）が伝導します（上述）．
On a membrane of the nerve fiber, an action potential in one place conducts by depolarizes the 'neighboring' membrane (as above-mentioned).


無髄線維には，電気抵抗の高い髄鞘がありません．
In non-myelinated fibers, the myelin, which has high electric resistance, does not exist.


そのため，活動電位はどこでも発生できます．
So, action potential can take place at any place.


そのため，１ヶ所の活動電位が脱分極させる「となり」が近い．
So, the 'neighbor' depolarized by an action potential is close.


そのため，単位時間あたりの移動距離は短い．
So, the conducting distance for a certain amount of time is short.


すなわち，伝導速度が遅い．
So, The conducting speed is slow.


有髄線維には，電気抵抗の高い髄鞘があります．
In myelinated fibers, the myelin, which has high electric resistance, does exist.


そのため，活動電位はどこでも発生できるわけではなく，髄鞘（電気抵抗は高い）の切れ目（すなわち，電気抵抗は低い．ランビエ絞輪とよばれる）だけで発生しえる．
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.


そのため，１ヶ所の活動電位が脱分極させる「となり」が遠い．
So, the 'neighbor' depolarized by an action potential is far.


そのため，単位時間あたりの移動距離は長い．
So, the conducting distance for a certain amount of time is long.


すなわち，伝導速度が速い．
So, The conducting speed is fast.
 
 


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//LEVEL:3
//LEVEL:3
//RAND
//RAND
ランビエ絞輪とは,髄鞘のくびれであり,電気抵抗が　 {~高い.=低い} .
 
At the node of Ranvier, which is the gap in the myelin, the electric resistance is {~high.=low} .


//LEVEL:3
//LEVEL:3
//RAND
//RAND
跳躍伝導における活動電位は,有髄線維のランビエ絞輪　 {=のみ.~以外} で活動電位が発生する.
Action potentials at the saltatory conduction, are generated {=only at.at ~places other than} the node of Ranvier.


//LEVEL:3
//LEVEL:3
//RAND
//RAND
跳躍伝導は　 {=有髄.~無髄} 神経線維に特徴的な伝導様式である.
Saltatory conduction is characteristic in the {=myelilnated.~non-myelinated} fibers.


//LEVEL:3
//LEVEL:3
//RAND
//RAND
跳躍伝導は　 {=速い.~遅い} .
In saltatory conduction, the speed is {=fast.~slow}.


//LEVEL:3
//LEVEL:3
//RAND
//RAND
有髄神経線維の伝導速度は無髄神経線維の伝導速度より　 {=速い.~遅い} .
The conduction speed of the myelinated fibers are {=faster.~slower} than that of the non-myelinated fibers.
 


//LEVEL:3
//LEVEL:3
//RAND
//RAND
無髄神経線維の伝導速度は有髄神経線維の伝導速度より　 {~速い.=遅い} .
The conduction speed of the non-myelinated fibers are {~faster.=slower} than that of the myelinated fibers.
 
 
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2012年9月21日 (金) 14:24時点における版

Saltatory conduction is the mode characteristic for the myelinated fibers. The conduction speed is high.

04224en.jpg

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

1.

At the node of Ranvier, which is the gap in the myelin, the electric resistance is high.low .

2.

Action potentials at the saltatory conduction, are generated only at.at places other than the node of Ranvier.

3.

Saltatory conduction is characteristic in the myelilnated. non-myelinated fibers.

4.

In saltatory conduction, the speed is fast. slow .

5.

The conduction speed of the myelinated fibers are faster. slower than that of the non-myelinated fibers.

6.

The conduction speed of the non-myelinated fibers are faster.slower than that of the myelinated fibers.

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