Final answer:
During exercise, several body systems work together to provide oxygen to the muscles and remove waste products.
Step-by-step explanation:
One scenario in which at least four body systems are used is during exercise. During exercise, the respiratory system brings in oxygen and removes carbon dioxide, the cardiovascular system pumps oxygenated blood to the muscles, the muscular system contracts to produce movement, and the nervous system sends signals to coordinate the movement.
These systems work together to provide oxygen to the muscles and remove waste products.