Page 111 - A Chain of Miracles

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bined length of 950 kilometers (590 miles). In some mammals,
muscle tissue has 3,000 blood vessels per square centimeter. If
10,000 blood vessels of the capillary network were to be placed
side by side, their combined width wouldn’t exceed the width of
a pencil tip. The diameter of these blood vessels is between three
and five microns which means three to five thousands of a mil-
limeter. 49
Water’s high viscosity rate lets blood pass through fine blood

vessels without blockages or slowdowns. Professor Michael
Denton states that were water’s viscosity rate even slightly less,
no circulatory system could preserve its functionality:
A capillary system will work only if the fluid being pumped
through its constituent tubes has a very low viscosity. A low vis-
cosity is essential because flow is inversely proportional to the
viscosity... From this it is easy to see that if the viscosity of water
had a value only a few times greater than it is, pumping blood
through a capillary bed would require enormous pressure and al-
most any sort of circulatory system would be unworkable... If the
viscosity of water had been slightly greater and the smallest func-
tional capillaries had been 10 microns in diameter instead of 3,
then the capillaries would have to occupy virtually all of the mus-
cle tissue to provide an effective supply of oxygen and glucose.
Obviously the design of macroscopic life forms would be impos-
sible or enormously constrained... It seems, then, the viscosity of
water must be very close to what it is if water is to be a fit medium
for life. 50

In short, like all of water’s other properties, its viscosity too
is just perfect for life. The viscosity of liquids covers a vast spec-
trum. But among the billions of different possible rates, water
has been created with perfect viscosity.

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