It pumps all of your blood.
The heart beats 70 times a minute, with each beat the heart pumps 60 to 90 mililiters (2 to 3 ounces) of blood out of the heart. It can move 5 to 7 liters of blood in one minute and 7600 liters (2000 gallons) per day. In a lifetime, it beats over 2.5 billion times and pumps over 200 million liters of blood.
Volume of a Human Heart - Hypertextbook
