How the Body Works : A Nerve Impulse

[legofilmer2000]

........ I didn't understand a WORD in that video!!

[dev009bitoo]

realy hlpfl...

[psipsychologytutor]

straightforward~ thx

[BaltoMovie]

Does anyone know how long it's takes for the Nerve to pump na+ out and suck k- in?

I'm guessing only a few mill-seconds but it's just so amazing I can't believe it

[avocadomilk]

what stops the impulses from traveling backwards?

[ryan110110110]

Research the refractory period + synapses and you will find out.

Plus if you think, the receptor, or any other means of starting an impulse, will be at one end of the neurone so the impulse is just going to travel along the axon, rather than going half way and jus turning back :P

[z1jj]

@avocadomilk

-If you artificially stimulate an axon from the center, it WILL travel in both directions away from the artificial stimulation. It just depends on where the action potential propagates.

[vestraya]

@avocadomilk recall that the membrane can only produce another action potential when it is at the resting portential. thus, during the refractory period right after the an action potential, the cell membrane cannot produce another action potential becuase it is hyperpolarized. so, a new action potential can only be triggered at the leading edge o the first polarized area.

got it from my text book.

[Giddy1993]

Wow heaps good :D

thanks :D

[WanahLovesAli]

This video was helpfull :)

[arkey82]

Thank you for adding this! Most helpful video I've found

[andrew567567]

wooow im naked right now! w

[107stafed107]

Just a skipped detail for everybody: At the end of the REpolarization (in which the cell becomes negative again)the Na+ K+ pump restablishes the Na+ outside the membrane and the K+ inside the cell.

[Cheesephone]

That voice really sounds like HAL...

[chisox4]

b-bit piece of shit.

[kezdodik1]

but i think the picture is backwards, he said its polarized hen potassium (K) ions are inside, bu the picture shows K on the outside. this is confusing.

[koomdogga]

its showing in what direction the ions are moving, not the highest concentration

[kezdodik1]

but i think the picture is backwards, he said its polarized hen potassium (K) ions are inside, bu the picture shows K on the outside. this is confusing.

[paulmascarne]

yes you r right!

[kriSSy1989ja]

when its polarised, the inside of the cell is negative relative to the outside of the cell an dat this point there's a high conc. of K ions inside and a low conc.of k ions outside, k tends to move into the membrane against its electrochemical gradient--which maintains the resting potential

[cyphi1]

that's still the inside of the cell...outside the cell Na+ exists.

[marijazza]

Interesting, yet brief.

[najyown]

yaa its nice but not very nice

[krazyMaz]

nice

[tsgopinath]

good work done. tanx for the videos

[tonyballa07]

does anyone have a calculator that looks similar?