Page 102 - The Miracle of Electricity in the Body

100 THE MIRACLE OF ELECTRICITY IN THE BODY

keep the body temperature stable by producing extra heat through in-
voluntary motion.

The contractions carried out by a muscle fiber as a result of the elec-
trical impulses from the nerve fiber reaching it one by one eventually fa-
tigue this muscle fiber. It needs to rest. Other fibers that have not previ-
ously contracted then go into action and permit the contractions to con-
tinue. However, if the electrical impulses from the nerve continue at
very frequent intervals, giving the muscle fibers no opportunity to rest,
then a state of contraction takes place that prevents further movement.
When you want to open a door, an electrical signal leaves your
brain and via the spinal column, heads directly towards your fingers.
The electrical current passes over the muscle surface and triggers the
millions of muscle fibers which, upon receiving the stimulus, immedi-
ately contract. Finally, the bicep or tricep muscle as a whole contract, and

your arm bends at the elbow.
All these processes take place in the blink of an eye. Thus, the elec-

Duplex myosin segment Myosin myofilament

Actin
strands Troponin Tropomyosin

Minute strands made by two kinds
Actin
Myosin of protein molecules, actin and
myosin, give the muscle fiber the
Actin
ability to contract. As these protein
molecules contract, they entwine
with one another like the teeth of
two combs, shortening the length
of the muscle fiber. Thus the mus-
cle’s expansion and contraction
come about. The flawless electrical
Bridges order created in the muscle cells
by God starts these reactions.