Customer Service Chat
Get quote & make Payment
Nerve impulse, Biology
VE IMPULSE (IT'S GENERATION) -
It is an electro chemical phenomenon manifested through ionic movement across cell membrane.
It was discovered by
A. L. Hodykin & A. F. Huxley (1939).
Impulse is a change in resting membrane potential of the cell towards positive side, also called as action potential or spike potential.
All cells bear positive charge outside (due to Na+) and negativity inside thus membrane remain in polarised state.
This potential across the membrane can be measured by putting electrodes inside & outside connected to a galvanometer or potentiometer or a voltameter.
When the cell is at normal resting state, the potential in animal cell ranges from - 60 mv to - 90 mv, this is called resting potential (nerve cell has about - 70 mv)
Any ext. stimulus reaching the membrane causes change in its permeability and Na+ starts rushing inside which results in the rise of potential towards positive side. This process of charge in potential (action potential) is called as depolarisation.
To bring the condition back to normal in nerve cell it is followed by exit of K+ out of the cell which results in resumption of the resting potential known as repolarisation.
Since the rate of exit of K+ is very slow while rate of entry of Na+ is very fast, this result in rise & stay of action potential for some time.
Posted Date: 10/3/2012 2:19:51 AM | Location : United States
Ask an Expert
Nerve impulse, Assignment Help, Ask Question on Nerve impulse, Get Answer, Expert's Help, Nerve impulse Discussions
Write discussion on Nerve impulse
Your posts are moderated
Write your message here..
What do you mean by nervous system, Q. What do you mean by Nervous System? ...
Q. What do you mean by Nervous System? Structural Organization: CNS + PNS Functional Organization: only concerned with PNS Sensory (Afferent) -> CNS Motor (Effe
Describe population and the frequency of the melanics, In one study of a he...
In one study of a heavily polluted area near Birmingham, England, a researcher observed a frequency of 87% melanic Biston betlularia. Calculate the frequency of the dominant allele
What is phylum of anelida, #question.
Upwelling zones of high biological productivity, Upwelling zones of high bi...
Upwelling zones of high biological productivity are found along the western coasts of the major continents. What causes this upwelling? a- cold currents moving from the equator tow
Biomedical application using a microcontroller, Search the web (mainly IEEE...
Search the web (mainly IEEE and ACM) publication databases to find a recent article on a biomedical application using a microcontroller. Clearly cite your reference(s). In your
Class of mollusca - monoplacophora, Class of Mollusca - Monoplacophora ...
Class of Mollusca - Monoplacophora Bilaterally symmetrical, with broad flat foot and single shell, mantle cavity has five to six pairs of gills; six pairs of nephridia of whi
What ions must a plant obtain from the soil, What ions must a plant obtain ...
What ions must a plant obtain from the soil in order to make (a) ATP, (b) chlorophyll? (a) To create ATP (adenosine triphosphate) a plant requires a supply of phosphate io
Cardiac output and its determination, The cardiac output is the volume of b...
The cardiac output is the volume of blood pumped from the heart every minute. It is obtained by the volume pumped with each beat (stroke volume) multiplied by the heart rate. The c
Explain about the tray and tunnel dryers, Explain about the Tray and Tunnel...
Explain about the Tray and Tunnel Dryers? Tray and tunnel dryers are widely used in the food industry. In both cases the material being dried is supported on multiple trays, wi
Codominance, CODOMINANCE The alleles which do not show dominance-recess...
CODOMINANCE The alleles which do not show dominance-recessive relationship and are able to express themselves independently when present together are called codominant alleles.
Accounting Assignment Help
Economics Assignment Help
Finance Assignment Help
Statistics Assignment Help
Physics Assignment Help
Chemistry Assignment Help
Math Assignment Help
Biology Assignment Help
English Assignment Help
Management Assignment Help
Engineering Assignment Help
Programming Assignment Help
Computer Science Assignment Help
IT Courses and Help
Why Us ?
~24x7 hrs Support
~Quality of Work
~Time on Delivery
~Privacy of Work
Human Resource Management
Literature Review Writing Help
Follow Us |
T & C
Copyright by ExpertsMind IT Educational Pvt. Ltd.