circulatory system  - the system that circulates blood through the body, consisting of the heart, blood and blood vessels., heart - a hollow muscular organ that pumps the blood through the circulatory system , blood vessel - a tubular structure carrying blood through the tissues and organs (e.g. vein, artery, or capillary ), vein  - a tube which carries blood low in oxygen towards the heart. They contain valves which stop the blood moving backwards. , artery - a muscular-walled tube which carries mainly oxygen-rich blood from the heart to all cells in the body., capillary - a very small and thin branching blood vessel that exchanges nutrients, gases and waste products between the blood and cells. , blood - a usually red liquid that circulates in the arteries and veins of humans and other vertebrate animals. Blood carries oxygen to and carbon dioxide from the tissues of the body,

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