Compléter The heartVersion en ligne Circulatory system par Mariangel Fernández 1 veins arteries ventricle valves heart atrium muscle two blood The heart is a . It sends all over our body . The heart is divided into parts : the right part and the left part . Each one of these parts has 2 cavities : the and the . The heart also has some " doors " called . When blood exits the it flows through the body in and .