Final answer:
The cardiovascular system assists the respiratory system in transporting oxygen and removing carbon dioxide from body cells.
Step-by-step explanation:
The respiratory system works closely with the cardiovascular system to transport oxygen and remove carbon dioxide from body cells. The cardiovascular system carries oxygenated blood from the lungs to body cells and returns deoxygenated blood back to the lungs. This collaboration ensures that oxygen is delivered to the cells for cellular respiration and that carbon dioxide, a waste product, is removed from the body.