The graph below shows how pulse rate changes with exercise. pulse Which of the following best explains how body systems worked together to create the results shown on the graph? Responses As the body uses its excretory system to eliminate wastes, the digestive system takes in more nutrients for growth and development. As the body uses its excretory system to eliminate wastes, the digestive system takes in more nutrients for growth and development. As the body exercises using the musculoskeletal system, the respiratory system takes in more carbon dioxide from the environment and releases oxygen. As the body exercises using the musculoskeletal system, the respiratory system takes in more carbon dioxide from the environment and releases oxygen. As the body breaks down food using the digestive system, the nervous system communicates to the musculoskeletal system to exercise the body as to prevent weight gain. As the body breaks down food using the digestive system, the nervous system communicates to the musculoskeletal system to exercise the body as to prevent weight gain. As the body exercises using the musculoskeletal system, the circulatory system pumps more blood and oxygen throughout the body.