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The circulatory system supplies blood which contains oxygen, nutrients, and other substances to the different cells of the body. 2. An open circulatory system allows blood to be distributed to the different organs in a lower pressure. 3. In a closed circulatory system, blood passes through blood vessels and moves due to a difference in blood pressures.
Closed System of Blood Vessels. â¢ The blood does not make direct contact with the tissue cells. â¢ The blood is retained in the blood vessels. â¢ A closed system is very responsive to the change needs of the organs and is highly efficient.