The main organ in the circulatory system is the heart, according to Hillendale Health. The two other major parts of the circulatory system are the blood and the blood vessels. More »

The heart and the lungs are the primary organs of the circulatory system. The lungs are responsible for adding oxygen to blood. This oxygen-rich blood is then pumped to the heart, which then circulates it through the art... More »

All vertebrates, segmented worms, such as earthworms, and cephalopods, such as squid, have closed circulatory systems. Closed circulatory systems allow larger animals to be much more active than those with open circulato... More »

The three major parts of the circulatory system are the heart, blood and blood vessels, according to Hillendale Health. The circulatory facilitates the movement and delivery of oxygen, water and nutrients to the body's c... More »

The basic circulatory system of vertebrate animals, which are those with a backbone, consists of a heart, the blood and the arteries and system of blood vessels. The heart pumps the blood first to the arteries and then t... More »

The respiratory system helps maintain homeostasis by regulating the intake of air into the body and by removing carbon dioxide from the blood, which in turn assists the circulatory system's function and many other operat... More »

The skeletal system works constantly with the muscular system, and the circulatory system, endocrine system and integumentary system also have interactions with it. The skeletal system provides vital support and protecti... More »