What is the main function of Circulation in the Body? It is for my National Massotherapy Exam... would just like detailed information...

The human circulatory system provides oxygen and nutrients
to the cells and tissues, and removes carbon dioxide and waste
products.

Oxygen enters the lungs where it passes into the
blood stream via the capillaries. It then enters the heart in the form of oxygenated
blood that is pumped throughout the body.  Carbon dioxide as a waste product of
respiration is carried from the tissues back to the lungs where it is
excreted.

Food is ingested then broken down into nutrients
(digested) in the digestive system where the nutrients are absorbed into the blood
stream.  The nutrients are carried by the circulatory system to all of the body’s cells
and tissues.

Waste products of metabolism are carried from
the tissues by the circulatory system to the liver where they are detoxified.  The
detoxified wastes are then carried to areas where they are excreted in the form of
carbon dioxide from the lungs, perspiration on the skin, feces in the digestive tract
and urine formed by the kidneys.

Thus, the circulatory
system facilitates the major body functions of respiration, metabolism and
excretion.