Answer:
cardiac and respiratory systems.
Step-by-step explanation:
Most body tissues need oxygen to produce energy. Therefore, this element must be continuously supplied for cells to function normally. Carbon dioxide (CO2) is a byproduct of this aerobic metabolism and must be eliminated from the environment.
The respiratory system works seamlessly with the heart system in the process of oxygen inhalation. After all, blood pumped by the heart is responsible for transporting oxygen gas from the lungs to cells and carbon dioxide from the cells to the lungs.