outsider <
outs...@sometime.individual.net> wrote:
> On 11/5/2011 9:26 PM, Canth wrote:
>> On Sat, 5 Nov 2011 23:01:05 -0000, "Ian Field"
>> <
gangprob...@ntlworld.com> wrote:
>>> "Wes Groleau"<Grolea...@FreeShell.org> wrote in message
>>> news:j91p4m$ak6$1...@dont-email.me...
>>>> On 11-04-2011 00:47, Julie Bove wrote:
>>>>> Very interesting! You may be onto something. I've been told that my
>>>>> body
>>>>> produces too much electricity. I can't use digital watches. When on my
>>>>> arm
>>>>> the numbers will just start flipping crazily.
>>>>
>>>> Your body does not produce electricity, clean or dirty.
>>>> Not even if you are related to Uncle Fester.
>>>
>>> Actually it does, all nerve impulses are electrical as are the signals in
>>> the brain.
>>>
>> For a very wide definition of electrical. Nerve& muscle impulses are
>> the result of a wave of depolarisation traveling across the surface of
>> the cell. No electrons are involved.
> Excuse me???????
> Where do you get this crap?
A good education which you clearly lack.
>> There is a potential difference across a cell membrane caused by
>> concentration differences of sodium and potassium ions, which is
>> actively maintained by chemical pumps in the membrane. When
>> conditions are right, the membrane becomes porous and the ions rush
>> through causing the potential difference to collapse. This propagates
>> along the cell membrane. That is the signal which causes
>> electromagnetic eddys to occur.
> "An ion is an atom or molecule in which the total number of
> electrons is not equal to the total number of protons, giving
> it a net positive or negative electrical charge."
>
http://en.wikipedia.org/wiki/Ion
The important difference is whether electrons or molecules are
moving. That is in more than one important sense a very large
difference :-)
>> In the case of nerves, when the signal reaches the end of the nerve
>> axon, it stimulates the release of chemicals to cross the gap to the
>> next cell. These are the substances referred to as neurotransmitters
>> eg serotonin, acetylcholine. When the chemicals reach the membrane of
>> the next cell, they attach to cell receptors which either increase the
>> permeability (stimulus) or decrease the permeability (inhibitor).
>> Other substances can affect the responsiveness of the cell receptors.
>> When the permeability reaches a critical level, it causes the cell
>> membrane at that point to depolarise and create a signal.
> "If, for example, a cell has a resting potential of -70mV, once
> the membrane potential changes to -50mV, then the cell has been
> depolarized. Depolarization is often caused by influx of cations,
> e.g. Na+ through Na+ channels, or Ca2+ through Ca2+ channels. On
> the other hand, efflux of K+ through K+ channels inhibits
> depolarization, as does influx of Cl– (an anion) through Cl–
> channels. If a cell has K+ or Cl– currents at rest, then
> inhibition of those currents will also result in a depolarization.
> "Because depolarization is a change in membrane voltage,
> electrophysiologists measure it using current clamp techniques.
> In voltage clamp, the membrane currents giving rise to
> depolarization are either an increase in inward current, or
> a decrease in outward current."
>
http://en.wikipedia.org/wiki/Depolarization
The current is generated in the sensor as part of the measurement
process. What is being measured is a chemically propagated electrical
signal. It is sufficiently like an electrical current that it is often
spoken of as one, especially when it forms part of an electrical
circuit as it does when it is measured by means of an electrical
sensor such as high impedance amplifier, but it is arguable that it is
not, strictly speaking, an electrical current. What I mean by arguable
is that experts argue about it. There is more than one good well
supported opinion.
>> Nerves which act as detectors eg rods and cones in the eye, have a
>> special organelle which when stimulated appropriately, causes
>> depolarisation of the cell membrane.
>> With muscles, the depolarisation causes the actomyosin fibres to
>> contract, shortening the length of the cell.
>> Nowhere in all of this is a single electron moving under the effect of
>> a potential difference, as happens in electrical circuitry.
> No where in nature does a single electron move under the effect of a
> potential difference. It is lots of them, in electron theory, that
> move from one atom or molecule to another precisely as it happens
> in human cells.
You seem to have forgotten that lots of electrons consist of a large
number of individual electrons. What moves the lot is moving the lot
by moving each one individually. As happens in conductive metals, in
ionised gases, or in the vacuum of an electronic valce or tube. A
potential difference moves a single electron. When there are lots we
call it a current. When there's only a few, or one, and it matters, we
can it an event or a signal. Note that the single cell sensor rods in
the human retina respond to single photons. But the nerve cells ignore
single cell responses so that detection doesn't propagate
upwards. Digital camera sensors also respond to single photons, but
again are ignored in favour of larger average responses in the
camera. But the effects can be seen as photon noise.
You're right that in the chemically propagated membrane potential
collapse there are lots of charged molecules moving in the same
direction. But it's certainly not "crap" to argue that the movement of
charged molecules is not in itself the passage of an electrical
current, although it can cause one.
> In semiconductors it isn't "electrons" that are said to be moving,
> it is "holes". But the nomenclature doesn't obscure the fact that
> an electrical current is flowing through a transistor nor does
> your pay on words obscure the same essential facts.
Like many plays on words it's an arguable point of theory which expert
theoreticians argue about. You taking one side doesn't make the other
side crap.
You should stop trying to pontificate on stuff you don't fully
understand. Your cited pages actually support what you think is
Canth's "crap" if you read them more carefully. Drink some coffee and
read them again, slowly this time, with open-minded curiosity rather
than a determined agenda.
--
Chris Malcolm