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Most of the cells in the human body are not in direct contact with the external environment, so rely
on the circulatory system to act as a transport service for them. Two fluids move through the
circulatory system: blood and lymph. The blood, heart, and blood vessels form the
Cardiovascular System. The lymph, lymph nodes and lymph vessels form the Lymphatic
System. The Cardiovascular System and the Lymphatic System collectively make up the
Circulatory System.
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