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Conduction of impulse

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Conduction of impulse

Postby 2810712 » Wed Mar 16, 2005 1:31 pm

How do dendrites conduct the impulse, is this same as the axons??? The dendrites are generelly shorter but in the spinal nerves they are veery long , so are there any Na+-K+ pumps in those? ? ?


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Postby Poison » Wed Mar 16, 2005 5:07 pm

Correct me if I'm wrong .Dendrites secrete neurotransmitters and carry the impuls that way. Axons have Na+-K+ pumps and uses the pumps for carrying the impuls.
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Postby MrMistery » Wed Mar 16, 2005 9:03 pm

I will correct you Poison because i think you are wrong.
The end of the axon(terminat buton) contains neurotransmitters inside some vezicles. When an electric impulse reaches these "bags" of neurotransmitters the cellular membrane and the vezicle membrane break and these neurotransmitters reach the dentrites of the next neuron
To answer your question 2810713, yes, long dentrites do have Na+-K+ pumps.
At least that is my opinion
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Postby Poison » Wed Mar 16, 2005 9:47 pm

Yes, Andrew. You are right. I must admit that what I've posted was a complete rubbish (I've understood now). I mixed up all the things. :oops:
Sorry for the confusion again. And thanks for correcting.
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OK then

Postby 2810712 » Thu Mar 17, 2005 6:18 am

Ok , so dendrites may have Na+/K+ pump, my teacher gave me less marks as I wrote that dendrites may have those pumps , now I will go and debate it there, thanx.
Still I want to know how the impulse is conducted in short dendrons -dendrites
They are short , but some mechanism , i think, must be there as impulse should be conducted from dendrites to dendrones and then to axon , how does this occur???

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Postby MrMistery » Thu Mar 17, 2005 6:39 pm

I've never heard of these dentrons but i will look into it
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really?

Postby 2810712 » Fri Mar 18, 2005 6:10 pm

As per my knowlwdge , dendrones devide into dendrites i.e.
an impulse travels from dendrite- dendron - cyton-axon- - -

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Postby MrMistery » Fri Mar 18, 2005 7:02 pm

The transmition of the nervous impulse is that same in dentrites as in axons. That is what by best book says
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similar but not same

Postby 2810712 » Sat Mar 19, 2005 5:10 pm

Ya,
but I think, it is similar but not same.
See schwan cells are absent on dendrites [ short] , but they may be present on long dendrites ; .are they ? ? ?this will affect the speed of transmission.
Also, how does the impulse from dendrite is conducted through cytons to axons ? ? ?

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Postby MrMistery » Fri Mar 25, 2005 9:16 pm

Scwamm cells are present in long dentrites, which have a mielin shieth. Senzitive newrons have such dentrites
What are cytons?
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Postby 2810712 » Fri Apr 15, 2005 4:56 am

cyton= nuron - axon/s - dendron/s
[dendrons= many dendrites ]

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Postby cytochromeP » Fri Apr 15, 2005 12:43 pm

I guess by cyton he means the "cell body" i.e. the large rounded region containing the nucleus and most of the organnelles.
Both - dendrites and axons conduct an impulse by the same mechanism. They differ functionally. Dendrites collect an impulse from a previous synapse and the axons end with a synapse across which the impulse would jump and discharge the successive neuron.
Myelin deposits are meant for faster impulse conduction. The mechanism of impulse conduction in such myelinated neurons is called "Saltatory Conduction" which differs from normal mode of conduction in that the impulse jumps from one 'node' to the next instead of traversing the entire neuronal length.
...and yess never heard of "DENDRONS" !
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