The term "circulatory" refers to the system in the body responsible for the movement of blood, nutrients, gases, and waste products. This system includes the heart, blood vessels, and blood. The primary function of the circulatory system is to deliver oxygen and nutrients to cells while removing carbon dioxide and other waste materials. In humans and many animals, the circulatory system is divided into two main parts: the systemic circulation, which supplies blood to the body, and the pulmonary circulation, which carries blood to and from the lungs for oxygenation. Proper functioning of the circulatory system is essential for overall health and well-being.