The correct interaction between the respiratory system and circulatory system is described in the following statement:
"In the lungs, oxygen is transferred to the blood and carried by red blood cells. Once it is distributed, the red blood cells pick up carbon dioxide and transport it back to the lungs, where it is expelled when we exhale."
This statement accurately summarizes how the two systems work together: the respiratory system facilitates gas exchange in the lungs (oxygen in, carbon dioxide out), while the circulatory system transports these gases throughout the body via the blood.