What is the main function of the cardiovascular system?

The main function of the cardiovascular system is to move blood for oxygen delivery. This system is crucial for maintaining life, as it is responsible for transporting oxygen from the lungs to various tissues and organs throughout the body. Oxygen is essential for cellular metabolism and energy production, which are vital for the functioning of all bodily systems.

In addition to oxygen, the cardiovascular system also transports nutrients, hormones, and other essential substances to the cells while facilitating the removal of carbon dioxide and metabolic waste. However, the primary focus of the cardiovascular system is the delivery of oxygen-rich blood to meet the metabolic demands of the body's tissues.

The other options address important functions that the body undertakes but do not capture the central role of the cardiovascular system in oxygen transport. For example, while the system does play a role in managing waste removal and can influence body temperature regulation through blood flow distribution, these functions are secondary to its primary role of ensuring oxygen delivery and nutrient transport to sustain life.