The Life Stream in our Bodies
The blood is the life stream. It carries food and energy
to all parts of the body; it scavenges the waste material
of living which would otherwise poison the living creature;
it helps to keep body temperature within the narrow limits
in which cells can stay alive; it fights off the unceasing
attacks of the bacteria of disease and decay. When the blood
ceases to flow, life ends if the supply of blood to the brain
stops for only a second, the person becomes unconscious.
Blood normally accounts for about 1/13th of a man’s
total weight. A man weighing 70 Kg has about 5.4 Kg of blood.
Blood is pumped by the heart into the arteries which branch
and become smaller and smaller , like the branches and twigs
of a tree, into capillaries ( from Latin, ‘capillus’ means
a hair) The blood leaves the capillaries for minute veins
which become bigger veins and returns to the lungs and
heart to start its journey again.