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ninjatacofortytwo

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Gender: male
Age: 24
Date Signed Up:4/04/2011
Last Login:7/30/2015
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Content Ranking:#4458
Comment Ranking:#16415
Highest Content Rank:#4410
Highest Comment Rank:#14556
Content Thumbs: 589 total,  955 ,  366
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Content Level Progress: 50% (5/10)
Level 56 Content: Sammich eater → Level 57 Content: Sammich eater
Comment Level Progress: 60% (6/10)
Level 124 Comments: Respected Member Of Famiry → Level 125 Comments: Respected Member Of Famiry
Subscribers:2
Content Views:66323
Times Content Favorited:16 times
Total Comments Made:256
FJ Points:813
Favorite Tags: wat (4) | no (3) | facebook (2) | hello (2) | i (2) | Love (2) | what (2) | You (2)

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    Did someone call my name? Did someone call my name?
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    My GF has pretty big tits My GF has pretty big tits
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    Morbid for Mexicans Morbid for Mexicans
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    Dildo what? Dildo what?
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    Morbid for Mexicans Morbid for Mexicans
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    So true So true
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    My favorite GIF My favorite GIF

latest user's comments

#116 - I really think there are too many pointless jobs as it is and …  [+] (1 new reply) 07/20/2015 on Baernie is bae 0
User avatar #217 - nimba (07/20/2015) [-]
Hey, we can all join the army right? That's sustainable right?
#18 - thank you, I love learning **** 07/11/2015 on Random Medical Facts, #4 +1
#6 - wouldn't those myelin sheaths actually cause impulses to trave…  [+] (5 new replies) 07/10/2015 on Random Medical Facts, #4 +4
User avatar #10 - destinaay (07/10/2015) [-]
the only action potentials are on those node of Ranvier (Ranvier'scher Schnürring, gotta love the german name), thus making the signal jump over the isolated areas and skip like >95% of the trail, like nanahara said
#7 - nanahara (07/10/2015) [-]
no, the sheets are spread out, with "bare" areas inbetween, called nodes of Ranvier. so the current kinda jumps from one node to the next. and the sheet stops unnecessary "activation" in the areas between the nodes of ranvier
User avatar #51 - Haentar (07/11/2015) [-]
But why is jumping outside from node to node faster than just traveling straight down the cell's (axon?)?
#53 - nanahara (07/11/2015) [-]
its kinda complicated, but i'll give it a shot. if you have a basic understanding of life science it will help.

tl;dr The myelin sheet works as an insulator around the nerve. it decreases the capacitance and increases the resistance.
The Impulse doesn't actually jump outside the axon on top of the sheets. but this myelin keeps the sodium inside not allowing it to leak out, and propagates inside the axon, and the impulse is "refreshed" at every node of Ranvier.


so.. in an unmyelinated nerves the action potential (the electrical impulse) is propagated in a way where there are channels which open once the cells sense a high enough voltage (threshold). so as the electrical impulse progresses through the axon, more and more sodium channels will open, thus maintaining this "high" voltage, and like this, it will propagate further and open more channels along the way.

You can imagine with this kind of conduction the concentration of sodium outside the cell must be sufficiently high, so that it can enter the cell once the channels open. if the outside concentration isn't high enough, the propagation of the impulse wont continue, and the nerve wont pass on the impulse to the next nerve.

so if a lot of channels are opening up right next to each other it will cause a decrease in sodium concentration. this means that this kind of conduction is decremental. it will get weaker and weaker the longer it has to travel (which is not good). the impulse moves like a wave. In addition to that it is more energy requiring and way slower (2 m/s) than a myelinated nerve (200 m/s).

The myelin sheet works as an insulator around the nerve. it decreases the capacitance and increases the resistance.
The Impulse doesn't actually jump outside the axon on top of the sheets. but this myelin keeps the sodium inside not allowing it to leak out, and propagates inside the axon. The impulse is "refreshed" at every node of Ranvier. thus the impulse is much faster (200 m/s) and not decremental.

so you can imagine how much energy is spared in myelinated nerves, as they only use about 0.2% of the channels compared to unmyelinated.
Also, these nodes are far enough apart for the sodium concentration to be unaffected by nearby cells channels, or the same cells channels. Thus the concentration of sodium at each node is high. as well as the density of these channels being higher at each node, compared to an unmyelinated nerve.

it is a bit more complicated than this, but im not gonna bother getting into it, unless you care. but other ions than sodium play a part too, and the myelin sheets have some function when it comes to regeneration of damaged nerves and maintenance of the nerve cell itself.
#18 - ninjatacofortytwo (07/11/2015) [-]
thank you, I love learning shit
#3 - so glad to see ************ reposting garbage lol  [+] (1 new reply) 07/06/2015 on Heroes +1
#4 - mudkipfucker (07/06/2015) [-]
it seemed the right day for it
#8 - It's a huge helper for sleep. I used to work for Quad Graphics… 07/06/2015 on alternative pay 0
#417949 - Picture 07/05/2015 on FJ PARTY TIME, FOR REAL 0
#18 - a fail. 07/02/2015 on If you order light sauce 0
#17 - Close, but this is...... **ninjatacofortytwo used "*roll …  [+] (1 new reply) 07/02/2015 on If you order light sauce 0
#18 - ninjatacofortytwo (07/02/2015) [-]
a fail.
#7 - I understand, that's part of what gives it away though. I can'… 07/01/2015 on Pregnant 0
#2 - Why Capitalize The First Letter Of Every Word You Ignorant Twat Lol  [+] (2 new replies) 06/30/2015 on Pregnant +19
#4 - fluffypain (07/01/2015) [-]
#7 - ninjatacofortytwo (07/01/2015) [-]
I understand, that's part of what gives it away though. I can't believe it's something that people do... Capitalizing the first letter of every word is damn retarded and people who do it make me laugh
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User avatar #1 - soundofwinter ONLINE (06/25/2014) [-]
**** you
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