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,

Circulatory system

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