cute_aditi
 |  Subject: Nervous Coordination Mon Dec 22, 2008 3:36 pm | |
| | WHY DO NERVE IMPULSE TRAVEL ONLY IN ONE DIRECTION?????????? |
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abhas
Active member
| | Subject: Nerve Impulses travel in one direction Mon Dec 22, 2008 9:03 pm | |
| Nerve Impulses travel in one direction
This is due to the refractory period i.e. Na+ channels are open or recovering.
The refractory period allows the voltage sensitive ion channels to restore their original polarity
Absolute refractory period - Na+ channels are open or recovering
Relative refractory period - Occurs when the membrane is hyperpolarised (-80mV), where the K+ channels are open. Action potentials are more difficult to generate during this period relative to resting potential (-70mV)
Last edited by abhas on Mon Dec 22, 2008 9:05 pm; edited 1 time in total (Reason for editing : because i can !!!!!!!!!!) |
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cute_aditi
| | Subject: Re: Nervous Coordination Fri Dec 26, 2008 4:17 pm | |
| | thanksss |
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