Page 161 - The Miracle in the Cell Membrane

Harun Yahya (Adnan Oktar)

out side the cell. There are between 100 and 200 sodi um-
potas si um pumps on every square microm e ter on the cell
mem brane sur face. Each one expels 200 sodi um ions a sec -
ond, and admits 130 potas si um ions.

Movement Potential and Signal
Transportation

The sig nal begins when a neu ron is stim u lat ed by anoth -
er neu ron or its envi ron ment. Immediately aft er ward, the
sig nal acts along the length of the axon, caus ing the cell
mem bra ne's poten tial to sud den ly reverse. In the cell mem -
brane, there are thou sands of pro tein chan nels or gates for
the pas sage of ions, but these gates are gen er al ly closed. In
the event of a sig nal, the sodi um chan nels open, and pos i -
tive ly charged sodi um ions flow in. Temporarily, there fore,
the inte ri or of the cell mem brane has a great er pos i tive
charge than the out side, and the rest ing poten tial is reversed,
rais ing the cell mem bra ne's poten tial to +50 mil li volts. The
rever sal of these char ges is called move ment poten tial. During
move ment poten tial, the potas si um gates open, and pos i -
tive ly charged potas si um ions flow out. This again bal an ces
the rest ing poten tial, so that the neu ron's inte ri or is again
neg a tive ly charged and the exte ri or pos i tive ly charged.
One sin gle nerve impulse trig gers this entire proc ess.
You can there fore com pare the sig nals to dom i nos. As one
dom i no falls over, it push es the one next to it. But in this
case, as the sig nal pass es, the "dom i nos" right them selves
again and stand up, pre par ing them selves for a sub se quent
move ment poten tial.

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