The Details of Even the Tiniest Molecule Are Enough to Destroy
the Theory of Evolution The protein thrombin allows the blood to
clot by converting fibrinogen to fibrin. Even though this
protein is always circulating through the blood, however, it
doesn't always lead to the clotting of blood, thereby preventing
blood flow. If there is bleeding in one blood vessel only, it
"understands" that clotting is needed there and sets about
clotting the blood. If thrombin always led to clotting, all of
the blood in the vessels would clot as a result of the thrombin
present, and the body could not survive with its circulation
totally blocked. So how does thrombin attain the ability to
cause clotting only in the place where it's needed? Thrombin is
usually present in blood plasma in an inactive form called
prothrombin. Being inactive, it cannot perform the duty of
clotting and in this way we are protected from the fatal
consequences of uncontrolled clotting. But what activates
prothrombin and converts it to the clotting fa