What is the main function of the cardiovascular system during exercise?

The main function of the cardiovascular system during exercise is to transport oxygen and nutrients to working muscles. As physical activity increases the demand for energy, the muscles require more oxygen to produce this energy through aerobic metabolism. The cardiovascular system plays a crucial role by increasing heart rate and blood flow, thereby enhancing the delivery of oxygen-rich blood to active tissues.

In addition to oxygen, the cardiovascular system also transports essential nutrients, such as glucose and fatty acids, which are vital for energy production. This efficient delivery system ensures that working muscles have the resources needed to sustain prolonged physical activity and perform optimally.

While regulating body temperature and removing carbon dioxide are important functions of the cardiovascular system, they are secondary to the primary goal of supporting muscle metabolism. Structural support is not a function of the cardiovascular system; rather, that role is fulfilled by the skeletal system. Thus, the transportation of oxygen and nutrients is central to the cardiovascular system's role during exercise, highlighting its importance in enhancing athletic performance and endurance.