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Atrium, blood, capillaries, circuit (2), fluid, heart, lungs, pump, side, systemic, tissues, ventricle, vessels.

The human cardiovascular system consists of the heart, the blood vessels, and blood.

The --heart--- is a muscular organ lying slightly to the left of the middle of the chest between two ---lungs---.

The heart acts as a ---pump--, which pumps blood round two independent circuits: the pulmonary---circuit--- and the systemic ---circuit---. The right side of the heart, consisting of the right atrium and the right ventricle sends ----blood--- into the lungs. The left side consisting of the left ---atrium--- and left ---ventricle--- and sending blood throughout the whole body, pumps with more force than the right ventricle.

The ---systemic--- circuit is much larger , so the left ---side---- of the heart is stronger and thicker than the right.

There are three kinds of blood ---vessels: arteries, veins, and capillaries. Arteries are vessels carrying blood away from the heart. Veins are vessels carrying blood from the --tissues-- to the heart. The blood vessels are supplied with nerves . --Capillaries--- are tiny vessels which connect the smallest arteries and veins. In the capillaries the blood is moving along at the rate half a millimetre per second.

Blood is the --fluid--- circulating through the heart , arteries, capillaries,and veins. The order of blood flow is: HEART- ARTERIES –CAPILLARIES – VEINS – HEART.