Page 88 - The Miracle of Electricity in the Body

86 THE MIRACLE OF ELECTRICITY IN THE BODY

Superior vena cava
THE ELECTRICAL ORDER IN
THE HEART IS ONE OF THE
SA node AV node SIGNS OF CONSCIOUS CREATION
Left atrium
Right atrium A node of tissue known as the SA
node in the right atrium of the
heart serves like a generator to
provide electricity, sending some
Pulmonary 72 electrical impulses a minute to
veins the heart of a resting adult. This
region produces faster electrical
impulses than other tissues. In
the event that the SA node is
damaged, other sections of the
heart’s electrical system are able
to take over that function, despite
beating at a lower speed.
Myocardium
For example, the group of cells
Inferior known as the atrioventricular
vena cava Purkinje Outer coronary bundle (bundle of His) has a
fibers Region between layer speed of 40 to 60 beats a minute.
ventricles If the SA node is damaged, this
tissue can take over the coronary
rhythm. The way that such a vital
system has been created together
with a backup system is just an-
other instance of God’s protec-
tion of man.

SA node

AV node

The heart’s natural battery is the SA node in the right atrium. The heart also con-
tains nerve fibers transmitting electrical signals from the SA node to other parts
of the heart. An electrical impulse leaves the SA node and travels to the right and
left atria, causing them to contract together, all in 0.04 of a second. There is then
a delay that allows the atrium to contract and the ventricles to fill with blood. The
electrical impulse heads for the AV node, and then to the atrioventricular bundle
after which it divides to the right and left and spreads rapidly towards the right
and left ventricles, using the Purkinje fibers, and enables them to contract at the
same moment.