The cardiovascular system, also known as the circulatory system, is . It consists of the heart, blood vessels (arteries, veins, and capillaries), and blood. This system plays a vital role in maintaining body temperature, delivering essential substances to cells and organs, and removing waste products. The cardiovascular system, also known as the circulatory system, is . It consists of the heart, blood vessels (arteries, veins, and capillaries), and blood. This system plays a vital role in maintaining body temperature, delivering essential substances to cells and organs, and removing waste products. The cardiovascular system, also known as the circulatory system, is . It consists of the heart, blood vessels (arteries, veins, and capillaries), and blood. This system plays a vital role in maintaining body temperature, delivering essential substances to cells and organs, and removing waste products.