What organ systems must work together to bring oxygen to the body's cells?

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Circulatory system and respiratory system

This is answer...

Respiratory, muscular, and cardiovascular/circulatory systems.

There are many organ systems that work together, but the main ones are the respiratory system, the muscular system, and the cardiovascular/circulatory system. The respiratory systems intakes the oxygen. The muscular system make this possible. An example would be the diaphragm, which helps the lungs to take in the oxygen. The cardiovascular system transports the oxygen to the cells through the blood.