Page 240 - The Miracle of the Blood and Heart

THE MIRACLE OF THE
BLOOD AND HEART

In the event of any kind of accident, the
brain—as the main center in the body—is
one of the organs most in need of protec-
tion. The blood vessels in our bodies act
in the knowledge of the brain's priority. If
the amount of blood reaching the brain
declines, both the brain's own blood ves-
sels and other blood vessels take precau-
tionary measures. The brain blood vessels
enlarge or constrict, and other blood ves-
sels elsewhere in the body slow the flow
of blood through them in order to divert
more to this important organ.

exhaust it. When climbing a mountain or engaging in strenu-
ous sporting activity, for instance, your body needs a higher
level of oxygen. You begin breathing very rapidly, and your
heart beats very fast, to meet your body's rising need for oxy-
gen. All your tissues being nourished with the same amount
of blood would lead you to experience a similar situation 24
hours a day.
The blood vessels are created specially to achieve this per-
fect control. In cases of emergency, they know to take the
appropriate and intelligent life-saving precautions. For exam-
ple, a cold environment that causes body temperature to fall
can be dangerous; the brain may suffer. Thanks to this superi-
or ability of the blood vessels, however, a human being can
withstand the cold. Upon encountering cold air, blood vessels
in the fingers and toes immediately constrict as the first pre-
cautionary measure. Since vessels in the hands and feet are
near the surface, they can cause the blood to cool. Their
constriction prevents blood from cooling too much
and the cooled blood from cooling down the heart
Harun and brain.
Yahya

238