How do the circulatory system and the respiratory system depend on each other?

The circulatory system and the respiratory system depend on each other because the respiratory system provides oxygen to the blood, which is then carried by the circulatory system to all parts of the body. In return, the circulatory system delivers carbon dioxide from the body's cells to the respiratory system to be exhaled. This exchange of gases is essential for the body to function properly and maintain homeostasis.