The circulatory system consists of the liver, arteries, capillaries and veins.

The circulatory system is the pumping mechanism that transports blood throughout the body.

In the heart the left ventricle contracts pushing the red blood cells into the saphenous.

The aorta is the body's largest artery.

From the aorta the blood moves through a series of increasingly smaller arteries untile it reaches the capillaries.

Veins are the junction between the arteries and capillaries.

Oxygen molecules detach from the white blood cells and slip across the capillary walls into the body tissue.

Deoxygenated blood begins to return to the heart through increasingly larger veins.

Blood returns to the heart through the left atrium.

Blood re-enters the right atrium, moves into the left ventricle and the blood journey begins again.