Page 61 - Miracles in Our Bodies

A CLOT FORMS
Platelets release chemicals that
make fibrin. The thread-like fib-
rin traps platelets and red blood
cells (right). A clot forms, which
stops the bleeding.

BLOOD TO THE ATOUGH SCAB
RESCUE The fibrin, trapped
Injured cells signal for cells, and fluid from the
blood harden into a
help. Platelets stick to-
protective scab. Healing
gether to plug the wound.
begins.
the illustration on the right, some cells in the blood are in-

formed of the damaged vein and head for that site at once.

First they align themselves along the wound and obstruct the

flow of blood by weaving a web. This web stiffens in time and
forms what we call a scar.

Now let's think together. Can this planned series of ac-

tions take place by chance? How is it that some blood cells are

informed of damage somewhere in the blood vessels, which is

like a gigantic world in relation to their size? Why do they

strive to prevent the flow of blood? How do they know that

they should close the wound in order to stop loss of blood?
Who taught these cells that they should close the wound?

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