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just a simple question

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just a simple question

Postby baikuza » Sat Dec 03, 2005 1:41 am

hey there.

is axon has sitoplasma?
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Postby victor » Sat Dec 03, 2005 1:30 pm

axon is just one of the nerve cells' processus along with dendrites...so, the answer is yes...but mostly filled with ionic solutions...
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Postby MrMistery » Sat Dec 03, 2005 3:59 pm

Of course axon has cytoplasm. It even has a special name, because the content of it is different than that of the cytoplasm in the cell body: "axoplasm". It has a very well developed cytoskeleton and at the end a lot of vesicles with chemical mediators.

@victor
NO! There are no more ions in the axoplasm than in regular cytoplasm. It is just that the axon has a lot of channels and pumps. At myelinic axons, they are concentrated in Ranvier nodes. Remember, only a VERY SMALL amount of ions contributes to the processes of depolarisation/repolarisation
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Postby baikuza » Mon Dec 05, 2005 12:50 pm

ok. axon has plasma. it called axoplasm(just read).

then one fact that i can not belief is once nerve cells become adult. the mitosis is stop, then if we lost nerve cell(s) we can not make the new one. permanently. uh.. kind of dangereous.

but i have the other question.

if we are stress, how is our nerve cell? is it strained?
then i am thinking.
at membrane potential an action potential, occur Na-K pump. we know that if the concentration of Na+ in the cell incereases the cell forced to get turgors condisition.
then what kind of effect will occur on this fact/mechanism?

i will wait your reply.
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Postby sdekivit » Mon Dec 05, 2005 1:08 pm

the deoplarization of a nerve cell only requires a few ions to enter and leave and furthermore a actionpotential is very short thus theres no effect os osmosis.

besides this, the axon has very much Na/K-channels and so on to regulate and myelinated nervers contain myelin sheets that won't let water diffuse into the cytoplasm.
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Postby baikuza » Mon Dec 05, 2005 1:40 pm

hei how about
if we were stresses how is our nerve cell? is it strained or kind of that.
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Postby victor » Mon Dec 05, 2005 1:44 pm

baikuza wrote:ok. axon has plasma. it called axoplasm(just read).

then one fact that i can not belief is once nerve cells become adult. the mitosis is stop, then if we lost nerve cell(s) we can not make the new one. permanently. uh.. kind of dangereous.

but i have the other question.

if we are stress, how is our nerve cell? is it strained?
then i am thinking.
at membrane potential an action potential, occur Na-K pump. we know that if the concentration of Na+ in the cell incereases the cell forced to get turgors condisition.
then what kind of effect will occur on this fact/mechanism?

i will wait your reply.


That's the consequences...the more developed the cell, it also lost it's ability to reproduce.. :wink:
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Postby baikuza » Mon Dec 05, 2005 2:06 pm

yeah, but this is kind of dangereous, i think.
uh.. the fact some times to ... can not hold by human being.
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