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Nervous Coordination

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cute_aditi




PostSubject: Nervous Coordination Mon Dec 22, 2008 3:36 pm

WHY DO NERVE IMPULSE TRAVEL ONLY IN ONE DIRECTION??????????
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abhas
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PostSubject: 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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PostSubject: Re: Nervous Coordination Fri Dec 26, 2008 4:17 pm

thanksss
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