It pumps oxygen and nutrient-rich blood throughout the body to sustain life.
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The heart pumps blood to the different parts in the body. 
first the blood from the different parts of the body(deoxygenated blood) then passes thru the superior vena cava then goes to the right atrium going down to the right ventricle then it will go to the lungs passing thru the pulmonary artery (oxygenated blood) coming back to the heart passing thru the pulmonary veins going to the left atrium and going down to the left ventricle then the blood will be distributed to the different parts of the body passing thru the aorta then the pumping of blood will go in a cycle to your every day life.