Human blood circulation is responsible for the transport of nutrients and oxygen to the different parts of the body. The label represent vein, artery, pulmonary artery and pulmonary vein respectively. Oxygen-rich blood travels through the pulmonary vein and the left atrium into the left ventricle. The pulmonary artery carries the deoxygenated blood from the right ventricle of the heart to the lungs. Aorta carries the oxygen rich blood from the left side of the heart to the body. The vena cava is responsible for carrying the doxygenated blood from the lower and middle parts of the body to the right atrium.

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